Rig detecting card ok, but not SLI

Tom|Nbk · 28 Sep 2011 at 19:10

Performance is mindblowing. Heat is unreal coming out the back of the rig

setter · 28 Sep 2011 at 19:15

Ghetto rig a fan behind the cards to help cool them, worked a treat on my pair.

Tom|Nbk · 28 Sep 2011 at 19:30

Aye i'll look into some ghetto mods

Pretty sure its not the psu most reviews say the psu hardly makes any extra noise even at 750w

Tom|Nbk · 28 Sep 2011 at 21:12

Pretty sure it's the PSU fan thats spinning up, I still have a fair bit of headroom yet so I didn't expect to spin up as much as it does.

I guess it's more to do with the heat rising through the case. Need to think of how I can cool the case down some more.

I'm fairly sure the PSU is coping fine looking over consumption figures and I've played all night!

Tom|Nbk · 28 Sep 2011 at 21:14

The GPU heat up to about 80c on one card and 76c on another, they only seem to hit around 50% speed.

Rroff · 28 Sep 2011 at 21:17

Stock fan on the GPUs is usually relatively quiet until it hits over 60% - think mine (granted GTX470) are audiable above other case noise once they hit ~64%. Most people with 4x0 SLI have found that adjusting the automatic fan profile using Afterburner can produce more optimal results in multi GPU (with mine I took the default profile and basically shifted it diagonally upwards and left so the idle fan speed was 5% higher and the fans kicked in 5% sooner.

Tom|Nbk · 28 Sep 2011 at 21:23

Think I'm going to swap out the PSU, it will still fetch pretty penny which should make an upgrade reasonable. The noise is definitely coming from here. Seems a shame, it can power it just fine >,<

Recommendations for a modern day TX750w Rroff?

Had this for a while now.

Surveyor · 28 Sep 2011 at 21:26

Treat yourself:

OCZ Z-Series 850W '80 Plus Gold' Modular Power Supply

Rroff · 28 Sep 2011 at 21:27

Be hard pressed to find a modern day TX750, corsair pretty much have the market pegged for affordable, reliable power supplies (AX models well regarded), lot of other makes have gone downhill with much more average units.

rjk · 28 Sep 2011 at 21:28

an AX 850 would be a superb addition.
it would power your 480 sli fine and shuts off the fan when not under load.

setter · 28 Sep 2011 at 21:30

my two 470's are hitting 77 and 72c, custom fan profile,

Above 60% theyre quite loud but i game with headphones, above pic was taken after playing the bf3 beta. Ive ordered a pair of silverstone air penetrator 140mm fans for the front of the case, the focused airflow should help, as air has to travel a fair distance to reach the cards in my case.

Tom|Nbk · 28 Sep 2011 at 21:30

Annoying that had I just plumped to an 850 a year or so back when I got this it would be fine!

I need something which will take heavy load and be very quiet

Tom|Nbk · 28 Sep 2011 at 21:37

current psu noise levels..

I reckon this is whats making a racket since I'm loading her up about 660w avg

Rroff · 28 Sep 2011 at 21:39

That is pretty good - gonna be hard pressed to find something that quiet tbh.

I've heard this one is pretty quiet even when pushed:

http://www.overclockers.co.uk/showproduct.php?prodid=CA-193-CM&groupid=701&catid=123&subcat=1103

But I don't know anything about those PSUs. (A little research suggests they are FSP based units which is usually a good sign).

EDIT: A bit more research suggests it stays quiet by letting the PSU run a bit warmer than normal and being conservative with the fan, and that if you push a really heavily load through it the fan kicks in v. loud.

Tom|Nbk · 28 Sep 2011 at 21:41

Then is it the PSU making the racket or the gpus, I'm mega confused now!

I honestly can't tell where it's coming from in my rig

setter · 28 Sep 2011 at 21:43

Corsair hx1000 for sale in mm here.

http://forums.overclockers.co.uk/showthread.php?t=18323134

Surveyor · 28 Sep 2011 at 21:45

Tom|Nbk said:
Then is it the PSU making the racket or the gpus, I'm mega confused now!

I honestly can't tell where it's coming from in my rig

Then while the system is running just briefly stop the GPU fans by gently pressing your finger in the centre of them.

Rroff · 28 Sep 2011 at 21:45

Tom|Nbk said:
Then is it the PSU making the racket or the gpus, I'm mega confused now!

I honestly can't tell where it's coming from in my rig

GPU fans back off very quickly after coming out of a game (with stock profiles), whereas PSU will take a lot longer so if the noise cuts out very soon after alt+tabbing out or quitting a game its probably GPU but if it continues for some time more likely to be CPU or PSU fan.

Tom|Nbk · 28 Sep 2011 at 21:45

I really didn't have it in mind to spend money. I'm moving house on the 21st

Annoying as hell that I'm about 100w away from the roof of my PSU yet the noise is letting it down and it doesn't seem like I can get THAT much improvement with other PSU's out there!

Tom|Nbk · 28 Sep 2011 at 21:47

Rroff said:
GPU fans back off very quickly after coming out of a game (with stock profiles), whereas PSU will take a lot longer so if the noise cuts out very soon after alt+tabbing out or quitting a game its probably GPU but if it continues for some time more likely to be CPU or PSU fan.

Could possibly be the CPU fan, needs investigation!