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post #5861 of 11736
Quote:
Originally Posted by ZealotKi11er View Post


Thanks. I placed a fan at the bottom of my case and positioned it near VRM2 and temps dropped ~15C. I've ordered one of these 290x heatsinks and will place that little cap on my VRM2. Hopefully then temps will be closer to VRM1 which at load is in the 50C range.
Edited by Spartoi - 1/30/16 at 6:18pm
    
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post #5862 of 11736
Quote:
Originally Posted by Spartoi View Post

Thanks. I placed a fan at the bottom of my case and positioned it near VRM2 and temps dropped ~15C. I've ordered one of these 290x heatsinks and will place that on little cap on my VRM2. Hopefully then temps will be closer to VRM1 which at load is in the 50C range.

VRM2 is technically easier to keep cooler.
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post #5863 of 11736
So.... Question. Do GPUs need more core votlage when running the memory at higher clocks? Because I think that's what mine is doing. I've had it crash a million times until I forgot to lower the voltage from +100mV but set the clock to 1160MHz from 1175MHz with memory being at 1700MHz and aux at +50mV. And it was stable, whereas before it would reboot with 1160MHz and +60mV that is stable with lower mem clocks.

Pardon my confused writing, but I was out with friends and I'm quite drunk, so it's hard to describe techical issues with any amount of coherence. tongue.gif
post #5864 of 11736
Quote:
Originally Posted by Spartoi View Post

Thanks. I placed a fan at the bottom of my case and positioned it near VRM2 and temps dropped ~15C. I've ordered one of these 290x heatsinks and will place that on little cap on my VRM2. Hopefully then temps will be closer to VRM1 which at load is in the 50C range.

please reply with results once you replace those.

meanwhile, are those any better than the stock ones that comes with the Nitro 390?
whats the thick size of the thermal pad strip? it looks like 3mm
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post #5865 of 11736
Quote:
Originally Posted by tolis626 View Post

So.... Question. Do GPUs need more core votlage when running the memory at higher clocks? Because I think that's what mine is doing. I've had it crash a million times until I forgot to lower the voltage from +100mV but set the clock to 1160MHz from 1175MHz with memory being at 1700MHz and aux at +50mV. And it was stable, whereas before it would reboot with 1160MHz and +60mV that is stable with lower mem clocks.

Pardon my confused writing, but I was out with friends and I'm quite drunk, so it's hard to describe techical issues with any amount of coherence. tongue.gif

Here is the thing. We have no Voltage control for Hawaii based cards. The memory for 290/290X is set at 5GHz but is rated 6GHz. To have it run 6GHz we have to increase the memory controller voltage to get it stable. AMD did this to lower the cards power consumption. Going above 1500MHz is basically how good the memory is clocking with same voltage as stock.
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post #5866 of 11736
Quote:
Originally Posted by tolis626 View Post

So.... Question. Do GPUs need more core votlage when running the memory at higher clocks? Because I think that's what mine is doing. I've had it crash a million times until I forgot to lower the voltage from +100mV but set the clock to 1160MHz from 1175MHz with memory being at 1700MHz and aux at +50mV. And it was stable, whereas before it would reboot with 1160MHz and +60mV that is stable with lower mem clocks.

Pardon my confused writing, but I was out with friends and I'm quite drunk, so it's hard to describe techical issues with any amount of coherence. tongue.gif
Usually either increasing AUX voltage (+25 to +50mV) or core voltage. Basically let say you need +50mV core voltage for 1600MHz memory clock. If you increase AUX voltage by +25 to +50mV (no need higher than this so far I found), then you can lower your core voltage. I just want to point out that if your card memory overclock doesn't respond to AUX voltage increase, then this trick doesn't work.
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post #5867 of 11736
Quote:
Originally Posted by ZealotKi11er View Post

VRM2 is technically easier to keep cooler.

So the VRM2 sensor on Sapphire 390s located on memory mosfet and not actively cooled by a heatsink or thermal pad?


Edit: Just watched a teardown video and noticed there's a microscopic thermal pad for that mosfet on a very thin part of the main heat spreader. Is that really a wise design? My vrm 2 is maxing out around mid 80s under heavy load on stock fan curve. I wonder if that thermal pad is really there...


https://www.youtube.com/watch?v=q1TdiGU6Rdk
Edited by ziggystardust - 1/30/16 at 8:35pm
post #5868 of 11736
Quote:
Originally Posted by ziggystardust View Post

So the VRM2 sensor on Sapphire 390s located on memory mosfet and not actively cooled by a heatsink or thermal pad?


Edit: Just watched a teardown video and noticed there's a microscopic thermal pad for that mosfet on a very thin part of the main heat spreader. Is that really a wise design? My vrm 2 is maxing out around mid 80s under heavy load on stock fan curve. I wonder if that thermal pad is really there...


https://www.youtube.com/watch?v=q1TdiGU6Rdk

That is very good design. You have the same card?
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post #5869 of 11736
Quote:
Originally Posted by ZealotKi11er View Post

That is very good design. You have the same card?

I have the 390x Nitro version. But the thing is; VRM 2 temp is maxing out around 85C while VRM1 is low 70s.

Another weird thing is; when vrms exceed a certain temperature, (usually the vrm2 first), only the rightmost fan kicking in which is actually blowing on vrm1. I'm kind of confused.
post #5870 of 11736
Just bought an XFX 390X from a member on here. So far so good. thumb.gif

I had their 390 before (which I just ended up using for a client's build) and their cooling is the same top-notch for both cards.

    
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