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is it safe to use tim (mx-4) on a 7970 memory chips instead of "thermal pads" because they are not available where i live - Page 2

post #11 of 38
I would not do it. Paste will not work correctly in large gaps like pads will. Maybe epoxy if it dried correctly, but then its permanent.

Paste has excellent transfer properties when its in a micro-thin film-like layer, not gooped in there like window caulk.
    
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post #12 of 38
Thread Starter 
Quote:
Originally Posted by deafboy View Post

If they used TIM from the factory then yes, you can use a different TIM. But what card came from the factory with TIM on the VRAM?!

it's a reference 7970 and i think it was made by amd directly i bought it used
Edited by invincible20xx - 3/31/13 at 2:03am
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post #13 of 38
Thread Starter 
Quote:
Originally Posted by Baskt_Case View Post

I would not do it. Paste will not work correctly in large gaps like pads will. Maybe epoxy if it dried correctly, but then its permanent.

Paste has excellent transfer properties when its in a micro-thin film-like layer, not gooped in there like window caulk.

but factory was using tim....

u guys are making me worried
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post #14 of 38
Quote:
Originally Posted by invincible20xx View Post

but factory was using tim....

u guys are making me worried

Wait, the factory sent you a card with no pads but with TIM? Never seen or heard that. If you do the same step as what they did I don't think you will have a issue.
Maybe post a pic of what you meant here.
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post #15 of 38
Thread Starter 
Quote:
Originally Posted by RussianC View Post

Wait, the factory sent you a card with no pads but with TIM? Never seen or heard that. If you do the same step as what they did I don't think you will have a issue.
Maybe post a pic of what you meant here.

i didn't take photos redface.gif i was in a hurry

it's a normal reference 7970 blower style i think it's made by amd directly i bought it used

when i opened it i found that they are using TIM on both the GPU die and the Ram Chips, thermal pads were on the VRMs only

there was just a bit of TIM on the middle of each ram chip not even covering the whole surface area of the ram chip there were no thermal pads what so ever

what i did was cleaned the old TIM from GPU die and the Ram chips and put MX-4

i've put the same amount of MX-4 that i've put on the GPU die on each of the ram chips ( Ram chips are smaller than the die) to make sure the the TIM will fill in the "space" and transfer the heat from the chips to the heat sink
Edited by invincible20xx - 3/31/13 at 2:13am
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post #16 of 38
Are you drunk or something? TIM on the VRAM? Do you for sure know what you are talking about?
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post #17 of 38
Quote:
Originally Posted by invincible20xx View Post

i didn't take photos redface.gif i was in a hurry

it's a normal reference 7970 blower style i think it's made by amd directly i bought it used

when i opened it i found that they are using TIM on both the GPU die and the Ram Chips, thermal pads were on the VRMs only

there was just a bit of TIM on the middle of each ram chip not even covering the whole surface area of the ram chip there were no thermal pads what so ever

what i did was cleaned the old TIM from GPU die and the Ram chips and put MX-4

i've put the same amount of MX-4 that i've put on the GPU die on each of the ram chips ( Ram chips are smaller than the die) to make sure the the TIM will fill in the "space" and transfer the heat from the chips to the heat sink

Can you provide a picture? im not exactly sure ive ever heard of a manufacturer doing that... but hey... if youre telling the truth, then thats news to me o.O Maybe they were using some sort of nonconductive TIM, but still that sounds kind of weird, since most of the time manufacturers put thermal tape or pads.... but not TIM on the IC chips themselves?

To be honest, you can go that way and follow what you SAY was originally there, but from all the responses youre getting, i just suggest not to go with that idea...? Have you tried thermal tape? the RAM chips itself dont get that hot... what really gets hot is the VRAM itself... use a thermal pad for that.
post #18 of 38
TIM will not conduct heat over a large gap, and is therefore useless if there is any kind of gap between the RAM chips and the heatsink. You want to use thermal pad of the appropriate thickness, for example

http://www.ebay.co.uk/itm/Phobya-Thermal-Pad-XT-7W-mk-120x20-x-1mm-/270919368615?pt=UK_Computing_Thermal_Compounds_Supplies&hash=item3f140d7fa7

Phobya Thermal Pad XT has good thermal conductivity, though they do a cheaper one too which doesn't conduct heat as well.

Just do a search for Phobya Thermal Pad XT on eBay, it comes in a range of thicknesses, and you just choose one appropriate for the gap you're trying to fill.
post #19 of 38
He did say he bought it used. So.... Slight Possibility is was the prev owner.
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post #20 of 38
Thread Starter 
Quote:
Originally Posted by Aesthethc View Post

Can you provide a picture? im not exactly sure ive ever heard of a manufacturer doing that... but hey... if youre telling the truth, then thats news to me o.O Maybe they were using some sort of nonconductive TIM, but still that sounds kind of weird, since most of the time manufacturers put thermal tape or pads.... but not TIM on the IC chips themselves?

To be honest, you can go that way and follow what you SAY was originally there, but from all the responses youre getting, i just suggest not to go with that idea...? Have you tried thermal tape? the RAM chips itself dont get that hot... what really gets hot is the VRAM itself... use a thermal pad for that.

what do you mean by "the vram it self" ?
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