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sli questions

D13

D13

D13

Associate
Joined
4 Oct 2008
Posts
989
Hi there

I have never previously considered using two cards. However it recently occurred to me my board is sli capable.

So i have a few questions on this;

- my system has stock clock 750 and four hard drives, the psu is an enermax 625w or something like that. Is this safe for sli 460's?
Is there anyone out there with sli 460's with a <650w psu who can share experience?
- I 'think' the cards have to have identical clock speeds but don't need to be the same board partner? is that right, if I were to actually fire them up will they automatically link clocks or do I need to manually adjust them?

any help would be greatly appreciated :)
 
just opened her up to confirm
i5 750
asus sabertooth p55i
enermax82 625awt
3 1tb hdd (2 are samsung spinpoint and one WD)
1 500gb hdd, 2 120mm case fans and 1 140mm case fan
and 4gb corsair ram
 
They should be the same GPU and same clock speeds.

Your PSU might not be enough. The 4** are power hungry beasts :)

I've not checked your motherboard but I assume you have to confirm its SLI capable?
 
The motherboard is SLI compatible.

Remember you can't mix different versions of the GTX 460 in SLI (768MB, SE, V1 and V2).

625W should be enough as long as the PSU is producing all/most of that on the 12V rail(s).

Power Consumption

The PSU ideally needs four 6 pin PCI-E power connectors as well.
 
ah thanks guys,
damn I didn't realise they would need the same clock speed, (or that factors such as v1.v2 would come into it)
hmm, will need to see if i can source an exact model of what i have already. cheers for the tips
 
Run GPU-Z - link here.

Check how much memory and how many shader processors your card has by running GPU-Z.

Purchase the same model. If it's a 336 shader 1GB model there's an EVGA version going cheap in the OcUK clearance section - link
 
thanks guys, my version is 336 unified shaders. i had my eye on that b grade one but i am worried as it is superclocked the clock speed difference would cause me a problem? I know you can flash bios to change clock speeds but would never try anything like that.
 
I'm not sure how SLI works these days but either the faster card will be downclocked or the cards will just run at different speeds (like CrossFire).

Either way it shouldn't cause any problems.
 
Surveyor said:
I'm not sure how SLI works these days but either the faster card will be downclocked or the cards will just run at different speeds (like CrossFire).

Either way it shouldn't cause any problems.
Click to expand...

If you look at both cores on a gtx 690 in gpuz its very odd one core boosts 13mhz faster than the other. This is after both cores have been oced to the same speed.
 
Surveyor said:
I'm not sure how SLI works these days but either the faster card will be downclocked or the cards will just run at different speeds (like CrossFire).

Either way it shouldn't cause any problems.
Click to expand...

6** series will happily chug along at different speeds. Unsure about before then as I was a multi GPU AMD user only!
 
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