Sapphire Radeon HD 7950

[pojavi]

Hiall. I have just bought a radeon 7950 vapor x but I can´t see the way to supply all the power this card needs, with the 2 6-pin connections available in the motherboard. If I use an 6-8 pin adapter, as the card has two 8-pin power inputs, it won´t get enough power to run. I think this model has a power consumption of 500w.

I would appreciate if you could send me some information.

Thanks in advance.

 

[startergo]

Hiall. I have just bought a radeon 7950 vapor x but I can´t see the way to supply all the power this card needs, with the 2 6-pin connections available in the motherboard. If I use an 6-8 pin adapter, as the card has two 8-pin power inputs, it won´t get enough power to run. I think this model has a power consumption of 500w.

I would appreciate if you could send me some information.

Thanks in advance.

There are several ways to skin the cat. One of them is reducing the power :
https://forums.macrumors.com/thread...0s-with-internal-power-bios-provided.1733650/
The other is to use the 2 mini 6 ports to 8 port cable for powering the 8 pin on the card and the 2 sata power adapters to power the 6 pin on the card.
the 3rd way is Pixlas mod
https://forums.macrumors.com/threads/pixlas-4-1-mac-pro-mod.1859652/

 

[pojavi]

ok thanks a lot. I think I will go for the second option, the easy one. Would these two cables be ok?:

https://www.amazon.es/gp/product/B07GPBRWDX/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B07GPBRWDX/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The dual 6-pin to 8-pin plugged into the motherboard and to the first 8-pin connector in the card; and on the other hand the dual sata plugged to the sata connectors, normally used for the cd-drive and the extra sata port, and then to the second 8-pin connector in the video card. I don´t mind to sacrifice these 2 sata ports.

Would this configuration work?.

 

[startergo]

ok thanks a lot. I think I will go for the second option, the easy one. Would these two cables be ok?:

https://www.amazon.es/gp/product/B07GPBRWDX/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B07GPBRWDX/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The dual 6-pin to 8-pin plugged into the motherboard and to the first 8-pin connector in the card; and on the other hand the dual sata plugged to the sata connectors, normally used for the cd-drive and the extra sata port, and then to the second 8-pin connector in the video card. I don´t mind to sacrifice these 2 sata ports.

Would this configuration work?.

Sure. That one plus this:
https://www.amazon.com/gp/product/B06XKWSBPY/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

 

[pojavi]

ok, perfect. The link you sent me is the same cable I told you in my previous message, isn´t it?.

 

[startergo]

ok, perfect. The link you sent me is the same cable I told you in my previous message, isn´t it?.

Your 2 links are identical .

 

[pojavi]

sorry, my bad. I wanted to put the following link and pasted the same link:

https://www.amazon.es/StarTech-SATP...TF8&qid=1546044913&sr=8-2&keywords=sata+8+pin

The card has two 8-pin, and the cable of the link you attached, is only 6-pin. Would it be better the sata 8-pins adapter?

 

[startergo]

sorry, my bad. I wanted to put the following link and pasted the same link:

https://www.amazon.es/StarTech-SATPCIEX8ADP-adaptador-alimentación-PCI/dp/B007Y8FSMQ/ref=sr_1_2?ie=UTF8&qid=1546044913&sr=8-2&keywords=sata+8+pin
If your card has 2 8 pins the safest option is the Pixlas mod . Even if you use 2 SATA to 8 pin you still have to reduce the power or it might not be stable at high load .

 

[pojavi]

Look, this is the card (pic of the power inputs attached):

https://www.pccomponentes.com/sapphire-radeon-hd-7950-oc-boost-vapor-x-3gb-gddr5

At the end in the specs, it says that two 8-PIN to 4 PIN Power Cables are included (adapters for PC I assume). If the original card is feeded in PC using this 2 adapters, it means that in all, the card only uses 8 pins (4 per each input power), doesn´t it?.

If you say that with the two 6-pin to 8-pin of the motherboard, plus the 2 satas, the card is over powered, then I could only used the sata of the cd-drive to feed the other 8-pin input of the card, instead of the 2 satas?. Would it be better?.

• Output
  • 1 x Dual-Link DVI
  • 1 x HDMI
  • 1 x DisplayPort
  • 1 x Single-Link DVI-D
  • DisplayPort 1.2
• GPU
  • Default: 850/ EZ Boost: 950 MHz Core Clock MHz Core Clock
  • 28 nm Chip
  • 1792 x Stream Processors
• Memory
  • 3072 MB Size
  • 384 -bit GDDR5
  • 5000 MHz Effective
• Dimension
  • 275(L)x115(W)x52(H) mm Size.
  • 2.5 x slot
• Software
  • Driver CD
  • SAPPHIRE TriXX Utility
• Accessory
  • CrossFire™ Bridge Interconnect Cable
  • DVI to VGA Adapter
  • 8-PIN to 4 PIN x2 Power Cable

 

[Enricote]

Hiall. I have just bought a radeon 7950 vapor x but I can´t see the way to supply all the power this card needs, with the 2 6-pin connections available in the motherboard. If I use an 6-8 pin adapter, as the card has two 8-pin power inputs, it won´t get enough power to run. I think this model has a power consumption of 500w.

I would appreciate if you could send me some information.

Thanks in advance.

Hi.
I have flashed exactly that model of AMD HD7950 Vapor X. Now using in My MP 5,1and Mojave
I bought TWO 6 pin to 8 pin cables via EBay. Very cheap. ( about 7 euros both )

https://www.ebay.com/itm/Mini-6pin-...h=item466e51bad5:g:wqMAAOSw9gRZ7gq~:rk:1:pf:1

https://www.ebay.es/itm/Mini-6-Pines-a-8pin-Pci-E-Tarjeta-de-V%C3%ADdeo-Cable-Alimentación-para-Mac-Apple-Pro/253859023948?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Use this procedure to install both cables:

 

[pojavi]

Hi.
I have flashed exactly that model of AMD HD7950 Vapor X. Now using in My MP 5,1and Mojave
I bought TWO 6 pin to 8 pin cables via EBay. Very cheap. ( about 7 euros both )

https://www.ebay.com/itm/Mini-6pin-...h=item466e51bad5:g:wqMAAOSw9gRZ7gq~:rk:1:pf:1

https://www.ebay.es/itm/Mini-6-Pines-a-8pin-Pci-E-Tarjeta-de-V%C3%ADdeo-Cable-Alimentación-para-Mac-Apple-Pro/253859023948?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Use this procedure to install both cables:

Thanks a lot Enricote. Sorry, but I am consufed now. We were discusing about the amount of power the card needed to give the exact amount of power, anda I have been told to use also the sata power supply cables. How these 2 cables plugged in to the motherboard can supply enough power? both connectors on the motherboard only have 175w. I think the card consumption is higher, isn´t it?

 

[Enricote]

Thanks a lot Enricote. Sorry, but I am consufed now. We were discusing about the amount of power the card needed to give the exact amount of power, anda I have been told to use also the sata power supply cables. How these 2 cables plugged in to the motherboard can supply enough power? both connectors on the motherboard only have 175w. I think the card consumption is higher, isn´t it?

[doublepost=1546093740][/doublepost]
In my experience as an user ( I have no technical knowledge) I have no issues using my MP and my flashed H7950 VaporX powered by Two 6 pin to 8 pin from motherboard. I use Lightroom, photoshop, Acrobat and Office in both Mojave and Windows 10.

I have no experience overclocking or using games or applications over stressing the GPU.

I simply followed instructions inside this forum to upgrade my MP to Mojave and flashing the GPU 7950


MacPro (early 2009). 4,1>> 5,1 - 2 x 3,33 Ghz 6-core Intel Xeon - 32 Gb 1333 DDR - AMD Radeon HD7950 VaporX 3072 MB - NVMe Samsung EVO 970 1Tb- AHCI SSD 250 GB - MacOs Mojave 10.14.2 - Windows 10

 

[pojavi]

ok perfect then. I have just ordered the two cables to see if my card works as well as yours. Thanks a lot for your feedback.

 

[startergo]

Ok just flashed my GV-R928XOC-3GD . The EFI screen is working, but I have problems with Windows in EFI mode. The windows logs in ( I can see the screen) and 5-10 seconds later goes black. Has somebody figured out what is causing that?

 

[h9826790]

Ok just flashed my GV-R928XOC-3GD . The EFI screen is working, but I have problems with Windows in EFI mode. The windows logs in ( I can see the screen) and 5-10 seconds later goes black. Has somebody figured out what is causing that?

The 7950 Mac EFI UGA doesn't work well with Windows EFI mode. You better use legacy mode, or boot from the non Mac EFI UGA VBIOS.

 

[startergo]

The 7950 Mac EFI UGA doesn't work well with Windows EFI mode. You better use legacy mode, or boot from the non Mac EFI UGA VBIOS.

Do you know what is causing that? Driver update? Is there 7970 EFI vbios or they are all the same. I saw 7970 posted by rominator in the netkas forum, but it did not work with the script.

 

[h9826790]

Do you know what is causing that? Driver update? Is there 7970 EFI vbios or they are all the same. I saw 7970 posted by rominator in the netkas forum, but it did not work with the script.

Don't know what causing the crash exactly. I only know Mac EFI UGA doesn't work well with Windows EFI mode (from all my own tests).

Nothing about driver. The crash can happen even before the GPU driver start to load.

You either boot the 280X from its original ROM, or boot from the flashed ROM in legacy Windows. No other work around or solution.

And no matter 7970, 280X, 7950..... form here, from Sapphire, from MVC, from Netkas..... they are all the same Mac EFI UGA extracted from the Sapphire HD7950 Mac Edition card.

Flash the card with another ROM won't help anything. It's the Mac EFI UGA (no alternate solution) causing the trouble in Windows UEFI mode, not any other parts in the ROM.

 

[pojavi]

Hi. I could finally flash my sapphire 7950 vapor-x. After receiving the cables to install it in my old PC (dual molex to 8 pin and a dual sata to 8 pin, as the card has 2 8-pin power inputs), I managed to make the original rom backup, then created the efi rom with the script, and finally load the efi rom into the card with atiwinflash. All working as expected. In the PC, the card is apparently working without any issues. Before I did the backup and the rest of the process, I installed the new drivers for the 7950 in order to avoid problems of recognition.

The problem, I ordered the two 6-pin to 8-pin cables for my MP two days ago, and they are expected to arrive by the end of the month. So, I won´t be able to see if I did it well until then : (

 

[Enricote]

[doublepost=1546206131][/doublepost]

Hi. I could finally flash my sapphire 7950 vapor-x. After receiving the cables to install it in my old PC (dual molex to 8 pin and a dual sata to 8 pin, as the card has 2 8-pin power inputs), I managed to make the original rom backup, then created the efi rom with the script, and finally load the efi rom into the card with atiwinflash. All working as expected. In the PC, the card is apparently working without any issues. Before I did the backup and the rest of the process, I installed the new drivers for the 7950 in order to avoid problems of recognition.

The problem, I ordered the two 6-pin to 8-pin cables for my MP two days ago, and they are expected to arrive by the end of the month. So, I won´t be able to see if I did it well until then : (

Be patient. Chinese delivery system is very very Slow!

 

[startergo]

Don't don't what causing the crash exactly. I only know Mac EFI UGA doesn't work well with Windows EFI mode (from all my own tests).

Nothing about driver. The crash can happen even before the GPU driver start to load.

You either boot the 280X from its original ROM, or boot from the flashed ROM in legacy Windows. No other work around or solution.

And no matter 7970, 280X, 7950..... form here, from Sapphire, from MVC, from Netkas..... they are all the same Mac EFI UGA extracted from the Sapphire HD7950 Mac Edition card.

Flash the card with another ROM won't help anything. It's the Mac EFI UGA (no alternate solution) causing the trouble in Windows UEFI mode, not any other parts in the ROM.

It looks like I found a solution, which works so far. I will let you know if it fails. I had to go to safe mode, revert to the Microsoft Basic Display adapter, preventing driver installation based on the hardware ID in the group policy and restart in normal mode.
[doublepost=1546287294][/doublepost]Does somebody know if there is a way relabeling the EFI boot in the boot Picker menu to something more meaningful?

 

[h9826790]

It looks like I found a solution, which works so far. I will let you know if it fails. I had to go to safe mode, revert to the Microsoft Basic Display adapter, preventing driver installation based on the hardware ID in the group policy and restart in normal mode.

This will work if the crash is from the driver.

I have't done any test with the build 1803 or 1809. All my tests about this issue were done in the much older Win 10 build. By that time, even the Windows 10 installation disc can't boot (BOSD) in EFI mode if the GPU is a HD7xxx Mac Edition card.

I've also heard some reports about they can use HD7xxx Mac EFI card in Windows 10 EFI mode.

So, may be the later Windows 10 build changed something fundamentally in the EFI mode. And the crash only cause by the GPU driver. If that's the case, your solution should work as expected.

 

[pojavi]

Hi all. I finally got to flash mine, a radeon 7950 vapor x. All seems to work fine, but the fans at idle are at 1500/1800 rpm. I thinks is too much taking into account that I have only firefox running. Which are the normal rpm rates for this card?.

I am using mac fans control as enricote indicated, but is there a solution that does not involve third party software?. I did a smc reset, but it didn´t do the trick.

It is very easy to lower the fan speed to 800 rpm using mac fans control based on pci ambient, but suddenly the power supply rpm rise up to 1000/1100 rpm. So now the ps fans are louder than the gpu fans.

 

[h9826790]

Hi all. I finally got to flash mine, a radeon 7950 vapor x. All seems to work fine, but the fans at idle are at 1500/1800 rpm. I thinks is too much taking into account that I have only firefox running. Which are the normal rpm rates for this card?.

I am using mac fans control as enricote indicated, but is there a solution that does not involve third party software?. I did a smc reset, but it didn´t do the trick.

It is very easy to lower the fan speed to 800 rpm using mac fans control based on pci ambient, but suddenly the power supply rpm rise up to 1000/1100 rpm. So now the ps fans are louder than the gpu fans.

It's a known SMC bug for long long time. You can stress the GPU for few seconds, then the PCIe and PSU fan will go back to normal.

cdf created an apps to "fix" that

https://forums.macrumors.com/threads/airout-a-solution-to-the-racing-fan-bug.2143951/

Or, you can override the fan profile.

https://forums.macrumors.com/thread...when-using-pc-non-efi-graphics-cards.1946672/

 

[pojavi]

Hi h9826790. I really appreciate the links you indicated. Thanks for your help.

The problem is that since I installed the 7950 plus 2 pcie cards (one for ports usb3 and and the other for an ssd M.2), I noticed that the PS fan have 1100 rpm or more, so now, as I said previously, the PS fan is much noiser than the gpu fans. Could it be that the rising in PS rpm is related to the new hardware installed because they are demanding more power? or it is just a problem related to the SMC bug o mojave itself?.

 

[h9826790]

Hi h9826790. I really appreciate the links you indicated. Thanks for your help.

The problem is that since I installed the 7950 plus 2 pcie cards (one for ports usb3 and and the other for an ssd M.2), I noticed that the PS fan have 1100 rpm or more, so now, as I said previously, the PS fan is much noiser than the gpu fans. Could it be that the rising in PS rpm is related to the new hardware installed because they are demanding more power? or it is just a problem related to the SMC bug o mojave itself?.

This should be from the same SMC bug. Both PCIe fan and PSU fan can be affected. Unless your cards are fault and drawing much more power than it should.

If you don’t like that fan noise, you can use the suggestion in my seconds link to create your own PSU fan profile.

However, make sure you run some stress test and monitor the PSU temperature. Just to make sure the high fan speed is from the bug, but not because the PSU is really warming up.