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New 7950 - what chips do I need to cool

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#1
Hi everyone,

I just bought and received two ASUS AMD Radeon HD 7950 DirectCU II. I plan to use it for my water cooling system with my MCW82 blocks. I already have the adapters for the cores, but I know I need to cool more than the core, so I bought some aluminum heatsinks with thermal tape. I know I need to put them on the VRM chips and the memory, and I know which chips are the memory modules, but could someone help me by pointing out all the VRM chips that I need to put a heatsink on? I have taken pictures of the naked card and posted it below. Thanks!



 
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#2
Everything marked with a Q is a regulator (in this case the little chips between the two capacitor columns, Q541, Q543, etc.). Inductors (L) will also benefit from cooling (they are close to the power connectors).
 
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#3
Here's the back of the card as well. I don't think there's anything that needs to be cooled though.

 
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#4
What a good score, great looking cards if you dont mind me exclaming.
 
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#5
What a good score, great looking cards if you dont mind me exclaming.
I was amazed myself; snagged them up lightly used for $500 shipped through eBay. And they work great; no issues at all.
 

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#6
i know this might be riduculous but wouldnt thermal epoxy mixed with thermal compound work better for heat transfer for ram/VRMs than thermal tape?

also as an optional solution put a fan on the back of the card, i mean it dont have to be a fast and loud unit, but it would help with cooling air to the PCB itself (PCBs act as heat spreaders too just not as well as metal is) 60-80 mm would work well
 
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#7
[...] Inductors (L) will also benefit from cooling (they are close to the power connectors).
Those are 12V input inductors, they don't need any cooling. Even the vGPU power inductors marked "R22" don't need to be sinked, light air flow is good enough.

Here, sink these:
 
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#8
i know this might be riduculous but wouldnt thermal epoxy mixed with thermal compound work better for heat transfer for ram/VRMs than thermal tape?

also as an optional solution put a fan on the back of the card, i mean it dont have to be a fast and loud unit, but it would help with cooling air to the PCB itself (PCBs act as heat spreaders too just not as well as metal is) 60-80 mm would work well
Actually, i've tried this, and it makes a big difference, quite a bit of heat comes off the back of the chip, helping to remove that drops temps on my card by 5-8c no joke already.:toast:
 

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#9
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#10
Those are 12V input inductors, they don't need any cooling. Even the vGPU power inductors marked "R22" don't need to be sinked, light air flow is good enough.

Here, sink these:
http://img.techpowerup.org/121019/card2-marked.jpg
Inductors can also heat considerably. I had boards with the inductors so hot you couldn't touch them. Even some which they were discolored & brittle due to heat. Though I suppose newer ones are more efficient.
 
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#11
Temperetures are likely due to conduction from associated regulators.
 
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#12
I'd go with what Largon has marked and if you plan on over volting ram and over clocking heat sinks on ram wouldn't hurt as well. Make sure you hit the marks that Largon marked, all important hot VRM components.
 
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#13
Actually, i've tried this, and it makes a big difference, quite a bit of heat comes off the back of the chip, helping to remove that drops temps on my card by 5-8c no joke already.:toast:
How did you attach it?
 
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#14
Okay, I've finally applied the heatsinks and got my system running. The biggest challenge was actually one I never anticipated. I needed to cut the PCI slot bracket from 3 slots to 2 slots wide so that I could fit the two cards in my case. Fortunately, a rotary tool did the job.

I ended up putting heatsinks on the RAM and the VRMs. The inductors don't have heatsinks. My case is a Nine Hundred Two, so a low-speed side fan blows on the cards providing some cooling as well. Interestingly, the hottest components on the card seem to be the memory modules, something I did not expect. They even seem hotter than the VRMs. I value silence over extreme speed, so I don't really plan to overclock the GPUs. Because of this I don't think the lack of cooling on the inductors will be a problem.

In regards to eidairaman1's post about using thermal epoxy, I actually have used it on other cards in the past, but I didn't find the cooling performance significantly better than thermal tape. I also am looking toward the future, when I eventually upgrade again, and I want to be able to reinstall the standard heatsink. The standard heatsink's heatpipes barely clear the memory modules and leave no room for heatsinks on them, which means that I will have to remove at least the memory heatsinks before selling the card. Doing this with thermal epoxy is a problem, although I may consider using it for the VRMs and the inductors if the cooling performance is inadequate.

I will try to get a picture of the cards with the heatsinks on them, but right now they are in the middle of the water cooling loop and are relatively difficult to take out to photograph. In hindsight, I should have taken a picture before installing them.

Thanks everyone for the help.
 
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#15
You can most likely OC those cards to 1000/1375 on stock volts increasing temps by only a bit and increase performance significantly,ive also been able to run 950/1375 while undervolted to 982Mv
 
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#16
Running at stock settings, the core temps max out around 48°C. It seems high for water cooling, but remember that I am using an adapter plate so there are actually two layers of thermal grease, so I think they are OK. The VRMs max out around 60°C, which seems safe to me, but can anyone verify this?
 
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#17
Running at stock settings, the core temps max out around 48°C. It seems high for water cooling, but remember that I am using an adapter plate so there are actually two layers of thermal grease, so I think they are OK. The VRMs max out around 60°C, which seems safe to me, but can anyone verify this?
Temps look decent. :cool:
 
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#18
Temperetures are likely due to conduction from associated regulators.
No no they were way hotter than the nearest MOSFETs.
 
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#19
I've noticed an issue with my system now that I've been using it a few days. When using anything graphically intensive (so far I've tried Furmark, Unigine Heaven, Left 4 Dead 2, and Starcraft II) the system randomly locks up well after starting the game. It's not a BSOD; it's a complete freeze of the content on screen that needs the power button to be held in order to resolve. I'm stuck in determining what is causing it. I'm left with 3 options: a cooling issue, a issue with Windows 8/AMD's drivers, or a flaw in the cards. I would normally just say it's a software issue and wait for the next driver release to occur, but I don't want the return period to expire on my cards if they are the problem. Does anyone have any suggestions on how I can diagnose or fix this?
 

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#20
I've noticed an issue with my system now that I've been using it a few days. When using anything graphically intensive (so far I've tried Furmark, Unigine Heaven, Left 4 Dead 2, and Starcraft II) the system randomly locks up well after starting the game. It's not a BSOD; it's a complete freeze of the content on screen that needs the power button to be held in order to resolve. I'm stuck in determining what is causing it. I'm left with 3 options: a cooling issue, a issue with Windows 8/AMD's drivers, or a flaw in the cards. I would normally just say it's a software issue and wait for the next driver release to occur, but I don't want the return period to expire on my cards if they are the problem. Does anyone have any suggestions on how I can diagnose or fix this?
with windows 8 being so new it could be an issue
 
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#21
What kind of heatsinks did you use for the VRMs?
 
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#22
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Audio Device(s) Onboard
Power Supply Corsair AX860i
Mouse Logitech PM MX / Contour RollerMouse Red+
Keyboard Logitech diNovo Edge / Logitech Elite Keyboard from 2006
Software W10 x64
Benchmark Scores yes
#23
IMO, way too small heatsinks, and thermal tape is so-so.

edit:
Grab a hacksaw and carve into some surplus heatsinks and you'll end up with something like this:
 
Last edited:
Joined
Jun 27, 2011
Messages
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Processor Intel I7 4790k (stock)
Motherboard ASRock H97M-ITX/ac LGA 1150 Intel H97
Cooling Prolimatech megahalem
Memory Crucial 2x4gb 1600mhz
Video Card(s) EVGA 1060 3gb
Storage OWC Mercury SSD 240 GB
Display(s) Asus 144hz
Case Raijintek Metis
Power Supply Corsair SF600 600w psu
Software Windows 10 64 Bit
#24

eidairaman1

The Exiled Airman
Joined
Jul 2, 2007
Messages
19,194 (5.03/day)
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4,798
System Name PCGOD
Processor AMD FX 8350@ 5.0GHz
Motherboard Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory 16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s) AMD Radeon 290 Sapphire Vapor-X
Storage Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s) NEC Multisync LCD 1700V (Display Port Adapter)
Case AeroCool Xpredator Evil Blue Edition
Audio Device(s) Creative Labs Sound Blaster ZxR
Power Supply Seasonic 1250 XM2 Series (XP3)
Mouse Roccat Kone XTD
Keyboard Roccat Ryos MK Pro
Software Windows 7 Pro 64
#25