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GPU cooling problem

J

jmg874

n00b
Joined
Jan 30, 2011
Messages
10
built my first water cooling rig. a 3x120 rad, mcp35x pump w/ the mcp35x-res. i'm using an XSPC rasa cpu block on a 1090t. One of my friends had an extra rasa cpu block sitting around so I decided to use that on my radeon 6970 (with ramsinks) and it's idling at 33c which i assume is just fine for a video card. anytime i run anything of substance it shoots up really fast to 85 - 90 celsius, over a period of maybe 30 seconds to a minute. I haven't let it run any longer than that because I don't want to fry it. I understand for this gpu above 95C is bad. after reaching those really hot temps it cools down again really fast. I don't understand why it keeps heating up/cooling down so fast.

now, all that said, I have it zip-tied on. I know how terrible that is but it's the only way i could get it on there as it's a cpu-block. I had considered that it wasn't seated well enough, but it seems to be. anyway, any advice would be great.

Thanks :D

p.s. my cpu stays nice and cool like it's supposed to during all of this.
 
I think you've probably answered your own question on this one. Its likely not attached well enough. The only other thing I can think of is really poor water flow through the gpu water block.
 
is there any other way to attach it without an adapter kit (it won't have one as it is a CPU water block)?
 
unfortunately no they don't exactly line up. the holes on the video card are in a narrower square. it feels a little bit ridiculous but i could use a strong twine or something couldn't I? I feel like that would work better than zip-ties... any other ideas though?
 
you need to make sure there's good pressure of the block onto the GPU. Pretty much the only way you can make that kind of force is with screws. You need to drill holes into your CPU mounting plate to match up with the GPU holes.
 
Most blocks have a slight bow on the base that will only have correct applied pressure with a secured mounting system. That's probably the #1 reason as stated above why your temps are very bad, seating is everything, especially on toasty hot modern GPU's.
 
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