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Is heatsink absolute necessary for core GPU water cooling?

post #1 of 13
Thread Starter 
Morning everyone, =D

As I notice that some 79x0 cards doesn't have any heatsink attached to its memory or VRM
like my reference 7950 from powercolor and 7970 non reference 7970, heat dispersion depends only on fans.
So if I decide to go with core GPU water cooling, is it absolutely necessary to stick heatsink on memory and VRM?
Given that I am not going to OC the memory at all.

The reason I am asking is because yesterday one of my 7950 installed with Accelero XTREME Plus has a heatsink fell off......
fortunately, it's a open air case and the rig managed to "kick" the heatsink on the floor instead of landing on the motherboard.
Seems the G1 comes with the XTREME isn't so realiable...

That scared me a lot, I am afraid if I stick heatsink on my 7970s and put in a closed case
A heatsink falls off from the top card could kill the card below, as my 7970 is not reference card so I can't go with any FC waterblock.

=P, so back to my original question, is it absolutely necessary to stick heatsink? or if it is necessary is there any way to prevent a fall
and kill from happening?

Thanks.
post #2 of 13
Usually you can get away without heatsinks as long as you have sufficiently strong fan blowing at them. I personally would go with heatsinks and a bit quieter fan blowing at them.
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post #3 of 13
Quote:
Originally Posted by ryantc View Post

Morning everyone, =D

As I notice that some 79x0 cards doesn't have any heatsink attached to its memory or VRM
like my reference 7950 from powercolor and 7970 non reference 7970, heat dispersion depends only on fans.
So if I decide to go with core GPU water cooling, is it absolutely necessary to stick heatsink on memory and VRM?
Given that I am not going to OC the memory at all.

The reason I am asking is because yesterday one of my 7950 installed with Accelero XTREME Plus has a heatsink fell off......
fortunately, it's a open air case and the rig managed to "kick" the heatsink on the floor instead of landing on the motherboard.
Seems the G1 comes with the XTREME isn't so realiable...

That scared me a lot, I am afraid if I stick heatsink on my 7970s and put in a closed case
A heatsink falls off from the top card could kill the card below, as my 7970 is not reference card so I can't go with any FC waterblock.

=P, so back to my original question, is it absolutely necessary to stick heatsink? or if it is necessary is there any way to prevent a fall
and kill from happening?

Thanks.

How does a heatsink come off? They're supposed to be tightened on there.. Screenshot?
And RMA that thing asap !?
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post #4 of 13
Quote:
Originally Posted by unseen0 View Post

How does a heatsink come off? They're supposed to be tightened on there.. Screenshot?
And RMA that thing asap !?

The little heatsinks you use with core-only waterblock have some two sided thermal tape under them so you just glue them on the chips. However, they easily come off if the chips have some residue on them, say, for example, some dust.

I would clean the chips that dont do a good contact for a start with something and make sure theres not somekind of residute left on them from the thermal pads which are usually used to make them to do contact with the stock cooler.
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post #5 of 13
Doesn't your heatsink have screws that hold it on tight?
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post #6 of 13
The G1 glue is crap and so are the heatsinks for the VRM's. Overheats the VRM's quite easily with >1.25v vGPU.

Re-apply the heatsink if it was VRM. if it was VRAM, don't bother. They run fine uncooled and OCed.
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post #7 of 13
Thread Starter 
Thanks all for your reply.
Quote:
Originally Posted by Carniflex View Post

Usually you can get away without heatsinks as long as you have sufficiently strong fan blowing at them. I personally would go with heatsinks and a bit quieter fan blowing at them.

me too, I prefer the later one as well.
Quote:
Originally Posted by Carniflex View Post

The little heatsinks you use with core-only waterblock have some two sided thermal tape under them so you just glue them on the chips. However, they easily come off if the chips have some residue on them, say, for example, some dust.

I would clean the chips that dont do a good contact for a start with something and make sure theres not somekind of residute left on them from the thermal pads which are usually used to make them to do contact with the stock cooler.

I guess I forget to clean the surface, the card I have is the one with fan in the middle, so originally there wasn't any thermal pads or heatsinks over the memory part, but dust....there is definitely a lot:o

Quote:
Originally Posted by Imprezzion View Post

The G1 glue is crap and so are the heatsinks for the VRM's. Overheats the VRM's quite easily with >1.25v vGPU.

Re-apply the heatsink if it was VRM. if it was VRAM, don't bother. They run fine uncooled and OCed.

it's the VRAM, so basically I will leave it like that.
and does it mean I have to only take care of the VRM heat dispersion, oh BTW what's the safe temp for VRM I remember it went up to 80-90 without heatsinks on them
post #8 of 13
''Safe'' temps are anything <100c for VRM's.
However, assuming you're going to overclock with that cooler, 80-90c on stock means 1.20v VDDC will already go past 100c.
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post #9 of 13
You can get away with not using heatsinks IF you have fan blowing over sufficient air all the time. I would suggest just getting better tape for the sinks. Only the VRMs really require cooling.
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post #10 of 13
Thread Starter 
that's some good news, as I can use less small heatsinks and the risk of fall and kill is reduced.
speaking about tapes, which brand is recommended? I have some 3M 467MP is that OK?

Oh, one thing about 3M 467MP, I am not sure if I got the "real" one or some fake one.
It's about 1mm thick and once applied if I want to peel it off the two adhesive side will stay on the surface
only the middle part (I don't know what's that made of, sort of solid thermal compound I guess) will survive

basically what I am trying to say is, the tape is a one-time disposable tape, once it's peeled off the sticky sides are gone and can't be reused anymore.
is this normal for such tape?rolleyes.gif

er, question about fans,
I got some 12cm cougar fans with 60.4 CFM, and the side panel fan position is just above the two 7970s
is this enough to blow these two cards? or I need something bigger?
Edited by ryantc - 6/3/13 at 10:30am
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