Sign in with
Sign up | Sign in
Your question

VRM and Memory heatsinks necessary Radeon HD 7850

Last response: in Graphics & Displays
Share
January 22, 2014 12:01:40 AM

If I liquid cool the GPU only, do I need heatsinks for the VRM/Memory? I will have a case fan blowing across the card.

I have two Radeon HD 7850s in Crossfire. The top one, an Asus Direct CU II design gets hot enough that I get a reduced framerate unless I have the Asus fan spinning loudly.

The lower card stays below 45 deg C while gaming at inaudible fan speeds. It exhausts at least some of it's heat out the back (His Ice-Q design with a single centrifugal fan).

I am simply looking for a slight overclock 1000/1248 and a quieter setup as I had with the single HIS card.

I purchased a Zalman LQ-320, with the intent of modifying the mounting bracket to fit my card. I will be drilling holes into the Intel bracket to bolt it on properly.

With the warranty void (I got the card for $100, so NBD), I might modify the original bracket/fans and renstall over the cooler, so it can cool my Memory/VRM a bit (at reduced RPM).
January 22, 2014 12:41:51 AM

You should try the NZXT Kraken G10 CPU to GPU cooling adapter/bracket. This alows you to use a variaty of cpu coolers on your GPU.
m
0
l
January 22, 2014 9:06:48 AM

Seeing that product is actually what prompted this. If you include shipping, it's $40 though. Doesn't seem worthwhile if I can drill some holes in the included Zalman Intel bracket. I did the measurements and it should work.

BTW, is it just me, or did NZXT just copy what dWood was doing for years, before mysteriously disappearing? Patent your designs people.
m
0
l
Related resources
a b } Memory
January 22, 2014 6:58:48 PM

Since you're not using a waterblock that can cover a huge surface area of your card including the VRMs - you should install heat sinks on your VRM because it always go hot. You don't want to get toasted components, right? ;) 
m
0
l
January 23, 2014 11:05:35 PM

That was my original question. The reason I want opinions or references to the necessity of coolers on the memory/VRMs is because they are uncooled from the factory. I would bet that the side fan is providing more cooling now that the heat sink is out of the way.

I say now, because I installed the Zalman cooler today. I drilled the holes in the AMD bracket (better clearance) and installed four fine 2mm x 20mm bolts/nuts. I counted the threads and ensured they were all even and that I wasn't bending the card.

There was a huge difference, and now my secondary card gets hotter during testing, but only to about 45 deg C. My main card dropped from 55 Deg C to 35 Deg C max during testing. I might have to spend another $60 when the Zalman cooler goes on sale again :) 

I bumped the speed up to the 1000mhz/1245mhz mild overclock I wanted. I gained about 5 FPS (10%) in testing, and 3d Mark 11 went up to 4,000 from 3,500. Overclocks did not improve my scores before due to excessive heat.

For those that are precise with a drill and at tightening/torqueing bolts, I recommend this over spending $40 on the NZXT bracket. I also recommend buying the cheapest version of a card possible and doing this mod, the numbers and Db are better.
m
0
l
!