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680MX Benchmarks please

Mac32 said:
Hmm, I just played Crysis 2 for over an hour at +285/+425. Totally stable, and as long as I use vsync, the temperature is not hardly any higher. It's crazy. Unfortunately, I got the sudden reboot. Is it really the 680mx drawing too much power? If so, that's a real shame, as otherwise the overclock was totally stable. :( Guess I have to go for a slightly lower overclock. Just played a section in Crysis 2 with lots of fighting and explosions in native resolution, everything at max, it kept 30fps vsync all the time. (If I get right into an alien and blast away, then the fps might go lower.)
Click to expand...

I have to go a bit below 275 to avoid the sudden reboot. Right now 250/250 works fine with fan at 2000rpm. Keeps both cpu and gpu lower than 80 deg.

Even if it is possible to go around or above 275 it feels unecessary to put that extra load on the psu and pushing it at its limits.
 
Rytter said:
I have to go a bit below 275 to avoid the sudden reboot. Right now 250/250 works fine with fan at 2000rpm. Keeps both cpu and gpu lower than 80 deg.

Even if it is possible to go around or above 275 it feels unecessary to put that extra load on the psu and pushing it at its limits.
Click to expand...

272 seems to be max for me :D, I'd like to overclock this to 1200 mhz :) Yes, it's possible lol Not right now but I just want it for the future :D

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2Turbo said:
Crap. Could it help to unplug some USB stuff? Is there anyway to lessen the power load?

Was it in Windows 8?
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I have a suggestion :D Remove windows and install it again, do not install any Apple drivers at all (windows support), install nvidia driver and overclock and see if it restarts. Can not be bothered to do it myself as have S H I T lots of things installed.
 
I just played Crysis 2 for more than two hours straight at +250/+375, and no shutdown this time. I do have one external drive connected to the machine, good idea about ejecting it first. Uninstalling all apple drivers, hmm..why could that work? I set the screen brightness at about 6, so the screen power draw is relatively low. It seems like vsync "on" is the way to go, as the gfx card gets a lighter workload most of the time. I played at 250/375 for over two hours, and the 680mx was at 69c max, fan speed only at 2450rpm. Pretty impressive! :)

I'm fairly sure even a +300/+450 overclock could work (stable in 3dmark11), if the PSU had more headroom. :(
I don't think it's a good idea to overclock right at the edge of what the PSU can tolerate, that could shorten the lifespan of the PSU considerably. I think I'll continue with the 250/375 overclock, it adds over 2500 graphics points in 3dmark11 (from P6857 to P8646 in overall score).
Pretty good for a mac, wouldn't you say..? :D
 
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Very awesome results. And don't forget vysnc off makes your eyes bleed from the tearing. I can't play without vsync on. You can't see more than 60fps on these 60hz panels anyway...
 
Mac32 said:
I just played Crysis 2 for more than two hours straight at +250/+375, and no shutdown this time. I do have one external drive connected to the machine, good idea about moving that one. Uninstalling all apple drivers, hmm..why could that work? I set the screen brightness at about 6, so the screen power draw is relatively low. It seems like vsync "on" is the way to go, as the gfx card gets a lighter workload most of the time. I played at 250/375 for over two hours, and the 680mx was at 69c max, fan speed only at 2450rpm. Pretty impressive! :)

I'm fairly sure even a +300/+450 overclock could work (stable in 3dmark11), if the PSU had more headroom. :(
I don't think it's a good idea to overclock right at the edge of what the PSU can tolerate, that could shorten the lifespan of the PSU considerably. I think I'll continue with the 250/375 overclock, it adds over 2500 graphics points in 3dmark11 (from P6857 to P8646 in overall score).
Pretty good for a mac, wouldn't you say..? :D
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I have done 272/500 stable, check my results, I even left a bat file for you guys. The problem isn't the PSU, I just turned down the brightness all the way down and disconnected all the USBs, still the same thing when the 4th test starts (3Dmark 11); it restarts. It is a driver issue or a firmware issue?
Could be Apple/Nvidia related?
I just don't get the fact that Nvidia is making us wait for an official driver!!!
 
WilliamG said:
Very awesome results. And don't forget vysnc off makes your eyes bleed from the tearing. I can't play without vsync on. You can't see more than 60fps on these 60hz panels anyway...
Click to expand...

Does vsync introduce input lag? Just wonder for FPS.
 
Sam.021 said:
I have done 272/500 stable, check my results, I even left a bat file for you guys. The problem isn't the PSU, I just turned down the brightness all the way down and disconnected all the USBs, still the same thing when the 4th test starts (3Dmark 11); it restarts. It is a driver issue or a firmware issue?
Could be Apple/Nvidia related?
I just don't get the fact that Nvidia is making us wait for an official driver!!!
Click to expand...

Well, I did several runs with 3dmark 11 at 300/450 with no reboot (windows 7 64bit here), but I'm sure Crysis 2 would reboot the machine pretty fast. It does make sense that the PSU is overtaxed, but if it's a fixable driver/software issue that would be great, as there is otherwise plenty of headroom for stable overclocking.
Why don't you lower your ram speed a bit? I tried 250/375 vs 250/410, and there was hardly any difference in 3dmark11. Didn't try the ram as high as +500 though..
Btw., don't understand why Crysis 2 got a lukewarm reception. It's a kick ... game! :D
 
2Turbo said:
Does vsync introduce input lag? Just wonder for FPS.
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Nope, not at all. It just limits the frame-rate from going over the actual refresh rate of the screen. I really don't know how people play games with it off. The tearing is so, so distracting!
 
Any update on the OC'ing? Hope someone gets past the limit with no restarts.

Any idea when an official windows driver might appear?
 
Sam.021 said:
I have done 272/500 stable, check my results, I even left a bat file for you guys. The problem isn't the PSU, I just turned down the brightness all the way down and disconnected all the USBs, still the same thing when the 4th test starts (3Dmark 11); it restarts. It is a driver issue or a firmware issue?
Could be Apple/Nvidia related?
I just don't get the fact that Nvidia is making us wait for an official driver!!!
Click to expand...

The reason you can't get higher is simply because iMac enclosure has its thermal limitations, not to say that 680MX has way lower voltage comparing to desktop 680, to reach way better TDP.

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2Turbo said:
Does vsync introduce input lag? Just wonder for FPS.
Click to expand...

you'll have no noticeable input lag and extremely smooth action if you have consistent 60+ fps (which is key demand for vsync=on)
 
Well, vsync at 30fps is also very playable (as long as it doesn't dip below 30 in intense firefights). The great thing with vsync@30 in Crysis 2 and other dx11 games, is at 30fps the gfx card gets a ligher workload because it's waiting for the monitor to refresh. So basically, you can overclock to +250/+375 and have the GPU temp below 70c (and thus a cooler CPU) even after several hours of intense gaming. But when you need the extra juice, the overclock takes care of it... :)
I would still prefer triple buffered vsync in Crysis 2 though, since I'm getting between 37-53 fps most of the time (with the 250/375 overclock, native resolution, everything at max except post processing). I don't understand why triple buffering isn't more common..

In short, the 250/375 overclock makes a big difference, is totally stable, and with vsync on, there are no heat issues whatsoever. :D
 
kaellar said:
The reason you can't get higher is simply because iMac enclosure has its thermal limitations, not to say that 680MX has way lower voltage comparing to desktop 680, to reach way better TDP.
Click to expand...


It's not a thermal issue, check the other posts I made.

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Mac32 said:
Well, I did several runs with 3dmark 11 at 300/450 with no reboot (windows 7 64bit here), but I'm sure Crysis 2 would reboot the machine pretty fast. It does make sense that the PSU is overtaxed, but if it's a fixable driver/software issue that would be great, as there is otherwise plenty of headroom for stable overclocking.
Why don't you lower your ram speed a bit? I tried 250/375 vs 250/410, and there was hardly any difference in 3dmark11. Didn't try the ram as high as +500 though..
Btw., don't understand why Crysis 2 got a lukewarm reception. It's a kick ... game! :D
Click to expand...


I too believe that this is a driver issue, I had the same problem with my Retina Macbook Pro, but after a few updates I had no more restarts, I just hope they release the bloody drivers already.
 
Sam.021 said:
It's not a thermal issue, check the other posts I made
Click to expand...
Is the integrated GPU thermal sensor the only thing you're standing for with this statement? Did you ever thought of, let's say, a possibility for some motherboard components (condensors located near GPU and used to work at the temperatures not higher than 95C, for example) to overheat too, though they don't have any thermal sensors?
That said, iMac is by no means comparable to a desktop ATX tower in terms of thermal design. Its fan system (I'm talking specifically about 2012 ones) is designed to create much more concentrated air flows that aimed to cool the GPU/CPU radiator and heatsink, leaving aside other components. It has nothing in common with ATX towers, where 120mm fans create the flows that cool all the internals.
 
Rytter said:
I have to go a bit below 275 to avoid the sudden reboot. Right now 250/250 works fine with fan at 2000rpm. Keeps both cpu and gpu lower than 80 deg.

Even if it is possible to go around or above 275 it feels unecessary to put that extra load on the psu and pushing it at its limits.
Click to expand...

Are you recording the temps during the game with GPU-Z or just alt-tab and checking the temps in windows? I'm getting mid 80s at 190/280 after several hrs of crisis 2.

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Mac32 said:
Well, vsync at 30fps is also very playable (as long as it doesn't dip below 30 in intense firefights). The great thing with vsync@30 in Crysis 2 and other dx11 games, is at 30fps the gfx card gets a ligher workload because it's waiting for the monitor to refresh. So basically, you can overclock to +250/+375 and have the GPU temp below 70c (and thus a cooler CPU) even after several hours of intense gaming. But when you need the extra juice, the overclock takes care of it... :)
I would still prefer triple buffered vsync in Crysis 2 though, since I'm getting between 37-53 fps most of the time (with the 250/375 overclock, native resolution, everything at max except post processing). I don't understand why triple buffering isn't more common..

In short, the 250/375 overclock makes a big difference, is totally stable, and with vsync on, there are no heat issues whatsoever. :D
Click to expand...

So Vsync really makes the difference? You're sure you're looking at a log file from GPU-Z? If so ill have to try with v sync on.
 
get my first reboot with 300/500 after one hour crysis 3 and another hour far cry 3. going back to 250/375.

here are some measurements with windows 7 64 bit:

gaming OC (automatic fanspeed max 2600 rpm):
crysis 3: max 190 W, all maxed out, 1920 x 1080, t2 AA, 20-30 fps
far cry 3: max 230 W, all maxed out, 2560 x 1400, no AA, 30-50 fps

Idle, internet, office (fan 1200 rpm):
60 W (with mac os x 10.8.3 roughly the same)

Youtube HD:
65 W (with mac os x 10.8.3 roughly the same)

coding video with cuda (gpu):
170 W

coding video (cpu):
130 W

temperatures during gaming (OC):
cpu max 97, in gta iv max 103
gpu max 90

under my post you see the imac 27" i7 geforce 680mx and 768 ssd.
left in idle
right OC gaming far cry 3
 

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Yep, that's consistant with my results. It's a bit frustrating confining the overclocking to +250/+375, when +300/+450 seems perfectly stable except for ehrm..the random reboots. :)

All this talk about the PSU not being able to give enough power to the GPU, this is just really a guess, although a reasonable one. Could it also be that the graphics card itself is the problem? Maybe it creates a reboot because it's struggling to keep up with a low volt setting (vs GTX680)? Maybe increasing the volt slightly would help maintain a stable +300/+450 overclock, however I'm a bit sceptical to tinkering with volt settings in an all-in-one computer system like the iMac. Any experience with this? We should find the specifications of the PSU, and how much power the iMac draws when playing these games overclocked (great job, heinzgruber).
+300/+450 doesn't make sense most of the time, but could really help with the newest, most demanding games like Crysis 3 and Far Cry 3. Again, if you can stand vsync@30fps in single player, then there should be no problem with the temperatures.

Edit: Btw., for some strange reason it seems if you want triple buffered vsync (or what seems like it anyway) in Crysis 2, you just have to choose window mode - then back to fullscreen mode. But, beware, the GPU get hotter, esp. if overclocking. This is comparable to disable vsync, then enable vsync again in Crysis 1. Weird...
 
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heinzgruber said:
get my first reboot with 300/500 after one hour crysis 3 and another hour far cry 3. going back to 250/375.

here are some measurements with windows 7 64 bit:

gaming OC (automatic fanspeed max 2600 rpm):
crysis 3: max 190 W, all maxed out, 1920 x 1080, t2 AA, 20-30 fps
far cry 3: max 230 W, all maxed out, 2560 x 1400, no AA, 30-50 fps

Idle, internet, office (fan 1200 rpm):
60 W (with mac os x 10.8.3 roughly the same)

Youtube HD:
65 W (with mac os x 10.8.3 roughly the same)

coding video with cuda (gpu):
170 W

coding video (cpu):
130 W

temperatures during gaming (OC):
cpu max 97, in gta iv max 103
gpu max 90

under my post you see the imac 27" i7 geforce 680mx and 768 ssd.
left in idle
right OC gaming far cry 3
Click to expand...

I'm back agian :D Windows 7 seems to be a little more stable than Windows 8.
With Windows 8 +324/+500 and Crysis 3, I last about 4-5 minutes, however; Windows 7 varies. I'm pretty certain that this must be a driver issue, when are we going to get an official driver?
 
680MX Official Driver Is Out!!!

Sam.021 said:
I'm back agian :D Windows 7 seems to be a little more stable than Windows 8.
With Windows 8 +324/+500 and Crysis 3, I last about 4-5 minutes, however; Windows 7 varies. I'm pretty certain that this must be a driver issue, when are we going to get an official driver?
Click to expand...

Official driver for 680MX OMG :D
Checked before I made my last comment then checked again and it was there LOL

http://www.geforce.com/drivers/results/57623
 
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