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-   -   New WC Loop...something's not right (http://www.hardwarecanucks.com/forum/water-cooling/49405-new-wc-loop-somethings-not-right.html)

Sleal December 14, 2011 03:33 AM

New WC Loop...something's not right
Alright guys so I recently put together a kit to keep my vid cards cold when gaming; Problem is, I can't even play BF3 on ultra with a watercooled 6870 crossfire combo? That just seems stupid. Especially when there are people using 1 580 and getting BF3 to run on ultra no problem. Both cards have been pushed to 950/1095 but it still doesn't seem to be enough.

The GPU's are looped in series after the cpu so one card is about 10* hotter than the other but neither one goes past 66-68 when gaming.

System specs are:
i5 760 @3.6
2x XFX 6870

XSPC RS360 rad with 3 XSPC fans push and 3 yate loon fans pull
2x EK 6870 FC waterblocks
XSPC DDC 3.25 pump/resevoir

Something tells me that I should have much better performance than what I'm seeing... I'm pretty certain all the air pockets are out of the system but its hard to tell. Oh, and I've already wiped all drivers and reinstalled again to rule that out.

Any suggestions?

bigFOIG December 14, 2011 10:21 AM

I don't know man, I'm just thinking that the 6870s in CF just aren't enough for BF3 on ultra.

Lpfan4ever December 14, 2011 10:28 AM

I have a feeling crossfire is your problem here. In IRC I heard a lot of bitching about AMD cards causing headaches. Hell, Arinoth sold his dual 6970's and went NVIDIA.

SugarJ December 14, 2011 10:32 AM

Is BF3 not running, or are you just not getting the FPS you think you should? Or are you more concerned about the temps? What resolution are you gaming at? About the only thing I'd consider changing in your loop is the pump. You might need a D5 to up the flow rate through 3 blocks.

And while my 580 would run ultra settings at 1920x1080, it certainly won't at 2560x1600.

KaptCrunch December 14, 2011 11:33 AM

what one hotter last in loop ?

I'd check WB's for EK famine disease or tweak block screws a bit more/less till find sweat spot

IMHO would go parrelle on GPU's an rest serial with DDC pump

Feanor December 18, 2011 06:36 PM

If you can run the game, but you want more FPS, then ocing is the only way i see aside from upgrading the gpu. Try to get your cpu in the 4,0 ghz zone, and oc the gpus till they do not cooperate anymore. Check if the temps are acceptable, which should be, as you're under water.

If you cannot run it (or it runs at stupid FPS, like 1-2), the drivers are probably the problem.

Keep in mind that the 6870 only has 1 gb of gddr5, so if you're in the best details possible territory (which you are if i understand you), that is gonna be the thing holding you back.

Adzsask December 18, 2011 06:49 PM

CPU is maxed out, needs more overclock. (used to own CF 5870's)

JD December 18, 2011 07:06 PM

I would strongly advise upgrading to 8GB of RAM (or more). That will likely give you some FPS gain.

If it's still not enough though, then unfortunately it's time to buy different GPU's. ATI's 7000 series is due in Q1 2012, so maybe look into buying those.

clshades December 19, 2011 01:05 PM

How does the 6870 stack up to the 6970? My buddy is running the latter and has NO issues.

matari December 19, 2011 01:37 PM

Check to see if blocks are installed correctly. Possible that the cards are overheating and throttling down.

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