Pegasus 665 Overheating

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Combat Marmot
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Pegasus 665 Overheating

Postby Combat Marmot » 22 Aug 2010, 18:29

A number of you may know that my pegasus 665 went back to Rock due to a graphics card problem quite some time ago. Ever since it came back the fan was on full nearly constantly, I attributed this to the BIOS upgrade they had applied at the same time to limit overheating. I haven't been using it very much for the last year as I built a new desktop, so I decided to take it to bits today and have a look at it. I was quite surprised at the thickness of the thermal "paste" (which looks more like blu-tak) that was applied.

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Re: Pegasus 665 Overheating

Postby EviL Ras » 22 Aug 2010, 18:50

OMG!!! Thats shocking!!! I would be straight on to rock (if its still under warranty) and kick up a big stink. Thats ridiculous!!!
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Re: Pegasus 665 Overheating

Postby matt » 22 Aug 2010, 18:52

have tried turning it off and on again?
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Re: Pegasus 665 Overheating

Postby Advocate » 22 Aug 2010, 19:05

blame toddy.....
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Re: Pegasus 665 Overheating

Postby Combat Marmot » 22 Aug 2010, 21:24

It's well out of warranty, when it returned I just had to put up with it as I couldn't be without a computer at the time. I'm wondering if I could salvage it with some other thermal paste and see if the fan noise is actually tolerable. What surprises me is that the heatsink for the CPU looks like it has no thermal paste at all.
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Re: Pegasus 665 Overheating

Postby kingosticks » 23 Aug 2010, 00:04

My 670 is as loud now as my 665 used to be. Fortunately it's been banished to the realm under my bed but I'm quite tempted to see if I have a similar thermal "solution" going on.
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Re: Pegasus 665 Overheating

Postby Johnmcl7 » 24 Aug 2010, 11:14

I don't know what that material is but it looks far, far too thick to me? The heatsink fitting should be very tight so that only a sliver of thermal grease is needed, if the fitting is that bad to need so much thermal compound the system is going to run hot.

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Re: Pegasus 665 Overheating

Postby Southwestwall » 27 Aug 2010, 10:08

That looks similar to the state of the thermal pad job on my XTi's GPU the last time it came back from Rock. It failed not long after the warranty expired so I bought the M1730 to replace it.
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Re: Pegasus 665 Overheating

Postby sayed » 28 Aug 2010, 16:33

Johnmcl7 wrote:I don't know what that material is but it looks far, far too thick to me? The heatsink fitting should be very tight so that only a sliver of thermal grease is needed, if the fitting is that bad to need so much thermal compound the system is going to run hot.

John


So could that explain why it always runs so hot. There is no other way to resolve this issue? My pegasus is still working and used at home to replace the dead desktop.
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Re: Pegasus 665 Overheating

Postby Johnmcl7 » 28 Aug 2010, 19:21

I don't know how flush the parts sit normally but my guess would be the fit is fine, it's just whoever has installed the parts has used too much thermal compound.

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Re: Pegasus 665 Overheating

Postby henrybutt » 05 Sep 2010, 14:06

A lot of manufacturers actually use these thermal pads rather than applying thermal compound. I would recommend leaving the ones on for the ram and applying something like Arctic Cooling MX-3 / MX-4 onto the graphics core.
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Re: Pegasus 665 Overheating

Postby FatIan » 06 Sep 2010, 10:12

Same with my x770, the ram chips all had small pads on but the main gpu core had proper compound on. There did seem to be a greater gap between ram chips and heat sinks than the gpu core main heat sink, so left the pads in place but put my own compound onto the gpu core.
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Re: Pegasus 665 Overheating

Postby Johnmcl7 » 07 Sep 2010, 02:40

henrybutt wrote:A lot of manufacturers actually use these thermal pads rather than applying thermal compound. I would recommend leaving the ones on for the ram and applying something like Arctic Cooling MX-3 / MX-4 onto the graphics core.


Those don't look like thermal pads on the GPU cooler though, the shape is too irregular and they're too thick plus I suspect thermal pads while not as good as decent compound they're still reasonably effective.

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Re: Pegasus 665 Overheating

Postby mrtoddie » 16 Sep 2010, 02:06

Just saw this....

Sorry..

Its not blue tack basically the thermal compound that was originally used was not thick enough to transfer the heat from the module to the actual heatsync so a thicker amount was needed.. basically the old heat paste was balled up and put over single chips rather than there being a mat over the two sets of chips.

That said there is too much on that one.

To explain, the cards that were originally used in the 665 are no longer used so they got an updated version of the card which I even think was DX10 compatible. that said they use smaller chips on the new card but no change to the actual fan and heat piping.

there can be a fair amount of the thermal paste on and it will run without overheating

One thing i notice aswell is your fan is very dirty.. so clean that bad boy off.. take out the screws that hold it to the heat sync and get in there with a brush get all the gunk out as that is one of the main places that causes break down.

I will gladly have a look at it if you shout your postage.

If anyone still has rock machines that are dodgy I will gladly have a look for you and see what I can do.

Unfortunately both the old management and new one were far too busy thinking of how quickly people can sort the numbers out rather than quality. which led to my demise as I wanted quality, they wanted numbers.

Edit : also is there any thermal paste on your CPU?? i cant see any in the picture...
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Re: Pegasus 665 Overheating

Postby sayed » 26 Sep 2010, 21:32

Had a clean of mine finally with a can of air and also noticed this. The old fella has a 8600 fitted after the old one burnt out. Runs the slight bit cooler.
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