Hi there!
I've upgraded iMac 27 late 2013 (iMac14,2 - A1419)
from
- i5 4570 3.2GHz
- 8GB RAM
- 755M 1GB
- 1TB HDD
- latest macOS Catalina
- stock thermal interface and about 5 years without any dust removing
to
- i7 4771 3.5GHz
- 32GB RAM
- SATA 1TB Samsung 870 EVO
- NVMe 1TB Samsung 970 EVO Plus + Sintech adapter + flat aluminium radiator
- new thermal interface (MX-4 at CPU and GPU + Gelid 1mm thermal pads at GPU VRAM)
- macOS Ventura via OCLP
It feels like new machine that will be good enough for web and audio for few more years I hope. But I get worried about temperatures. There is some tests (sorry for photos instead of screenshots):
idle before (fan @ 1200 RPM)
idle after (fan @ 1200 RPM)
full load before (fan @ 1900 RPM)
full load after (fan @ 2650 RPM)
As you can see, idle temperatures are similar. With full load GPU/CPU temperatures mostly are the same but 1st CPU core always about 100C, fan at full blast instead of 2k RPM with i5 and I've noticed thermal throttling - after about 1 hour of FurMark+CPU Burner it goes to 2.7GHz. After some cool down and running only CPU Burner it keeps stock 3.5GHz for about 1-2 minutes and then goes to 3.3-3.4GHz.
Yes, i7 definetly hotter that i5. Yes, even modern iMacs with i7/i9 have thermal throttling. But I've replaced all thermal interfaces and did very deep cleaning. So even after that I'm hearing fan very often. Not every time, because while browsing (for example - single 4k video at Safari) i get CPU temp at 60-70 and GPU at 45, while fan start speeding only when CPU goes over 90 degrees.
Is it normal temperatures?
Why I'm worried about:
- Instead of brand new MX-5 I've forced to use about 5 yo MX-4 (internet says that MX-4 can last for 8 years) because it seems that MX-5 was defective (it was solid as .... and I can't apply it properly).
- While assembling CPU and cooling system (hardest part when you need to flip it over) I only succeeded to mount two left screws at CPU backplate, other two holes didn't matches each other so I had to rotate cooling system for about 1-2 degrees so all holes got matched and I got chance to mount last two screws. And I'm afraid that while rotating the cooling system it could wipe off some thermal paste from CPU/GPU or thermal pads can get off from VRM.
Thanks in advance.
I've upgraded iMac 27 late 2013 (iMac14,2 - A1419)
from
- i5 4570 3.2GHz
- 8GB RAM
- 755M 1GB
- 1TB HDD
- latest macOS Catalina
- stock thermal interface and about 5 years without any dust removing
to
- i7 4771 3.5GHz
- 32GB RAM
- SATA 1TB Samsung 870 EVO
- NVMe 1TB Samsung 970 EVO Plus + Sintech adapter + flat aluminium radiator
- new thermal interface (MX-4 at CPU and GPU + Gelid 1mm thermal pads at GPU VRAM)
- macOS Ventura via OCLP
It feels like new machine that will be good enough for web and audio for few more years I hope. But I get worried about temperatures. There is some tests (sorry for photos instead of screenshots):
idle before (fan @ 1200 RPM)
idle after (fan @ 1200 RPM)
full load before (fan @ 1900 RPM)
full load after (fan @ 2650 RPM)
As you can see, idle temperatures are similar. With full load GPU/CPU temperatures mostly are the same but 1st CPU core always about 100C, fan at full blast instead of 2k RPM with i5 and I've noticed thermal throttling - after about 1 hour of FurMark+CPU Burner it goes to 2.7GHz. After some cool down and running only CPU Burner it keeps stock 3.5GHz for about 1-2 minutes and then goes to 3.3-3.4GHz.
Yes, i7 definetly hotter that i5. Yes, even modern iMacs with i7/i9 have thermal throttling. But I've replaced all thermal interfaces and did very deep cleaning. So even after that I'm hearing fan very often. Not every time, because while browsing (for example - single 4k video at Safari) i get CPU temp at 60-70 and GPU at 45, while fan start speeding only when CPU goes over 90 degrees.
Is it normal temperatures?
Why I'm worried about:
- Instead of brand new MX-5 I've forced to use about 5 yo MX-4 (internet says that MX-4 can last for 8 years) because it seems that MX-5 was defective (it was solid as .... and I can't apply it properly).
- While assembling CPU and cooling system (hardest part when you need to flip it over) I only succeeded to mount two left screws at CPU backplate, other two holes didn't matches each other so I had to rotate cooling system for about 1-2 degrees so all holes got matched and I got chance to mount last two screws. And I'm afraid that while rotating the cooling system it could wipe off some thermal paste from CPU/GPU or thermal pads can get off from VRM.
Thanks in advance.
