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MCP655 and radeon hd6990 questions

Last response: in Overclocking
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February 27, 2012 12:27:24 AM

Hi guys! I just set up my liquid cooling system and I'm having some doubts as above.
Firstly, I'm using swiftech mcp655 pump and I got a lot of difficulties when I was trying to use my 3/8id 1/2od tube with it. I made it at the end but for the future if I want to change the tube or reposition my pump and stuff like that...I think I would need a top like the EK-D5 X-TOP or may be some other cheaper solutions like using some reducers from 1/2 to 3/8 ? or buy a new 1/2id tube and 2 new 1/2id fitting and use it for in, out let of the pump ?

The next problem is my AMD RADEON HD6990 (using XSPC razor waterblock) is having a very strange temp...its gpu1 and gpu2 has around 10-14 degrees differences (the gpu 1 is always hotter)...should I worry about it ?

please let me know your opinions guys! Thanks and sorry about my english =.=
a c 330 K Overclocking
February 27, 2012 12:35:48 AM

The D5/MCP655 is native 1/2"ID...why not just use 1/2"ID tubing and fittings for your entire loop? This is a better solution than using those 3/8"-1/2" reducers that come in that package...just makes things more difficult than they really need to be.

Quote:
The next problem is my AMD RADEON HD6990 (using XSPC razor waterblock) is having a very strange temp...its gpu1 and gpu2 has around 10-14 degrees differences (the gpu 1 is always hotter)...should I worry about it ?


This shouldn't happen. I run SLI GTX 560 Ti's in my loop, and they are always within about 1C of one another. I am guessing that the GPU block isn't seated correctly? Watercooling should keep these temps very, very close to one another.
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February 27, 2012 12:43:42 AM

Well because I used 3/8id tube and fitting for a while and just changed my pump to the mcp655...

and about the 6990, I mean I only uses 1 physical cards but as you know there are 2 gpus inside...will it make any differences ?
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February 27, 2012 1:02:04 AM

also if I use Swiftech D5 Pump Housing Custom G1/4 Threads then use 3/8 fitting to fit my 3/8 loop, will it have any bad effect to my pump ?
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Best solution

a b K Overclocking
February 27, 2012 3:03:27 PM

franky nin said:

and about the 6990, I mean I only uses 1 physical cards but as you know there are 2 gpus inside...will it make any differences ?


A temp difference of 10-15C doesn't sound right though - it would mean that your GPU isn't dumping enough heat to the block/loop and the chip is heating up. I would definitely check and reseat the GPU block.


Quote:
also if I use Swiftech D5 Pump Housing Custom G1/4 Threads then use 3/8 fitting to fit my 3/8 loop, will it have any bad effect to my pump ?

There won't be any issues with that. It makes sense to reuse tubing you already have (just didn't know that from the start).
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March 1, 2012 1:07:43 AM

Best answer selected by franky nin.
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February 5, 2013 1:11:36 AM

Dude you are wrong... You shouldn't worry about a temp difference between GPU1 and GPU2. And design it that GPU 1 is always hotter then GPU 2, because GPU 1 has more activities than GPU 2 (GPU 1 is primary and always works more than GPU 2). So no you don't need to worry at all!
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