SLI - Why isn't my second card doing much?

tadashisensei · Feb 9, 2014

When i run something like Valley Benchmark my second card starts out fine then lowers to 500 Mhz then down to about 324 Mhz (idol) wile my other card is up at 1202 Mhz

Ps. I'm running 2 Gtx 780s

hdshatter · Feb 9, 2014

Did you turn on SLI in the Nvidia drivers? Are they connected with an SLI bridge and is it securely attached?

Brantyn Gerik · Feb 9, 2014

1. sli bridge installed?
2. sli enabled in nvidia control panel?
3. is motherboard sli capable?
4. is power supply capable of outputting at least 42 amps on the 12v rails per 780?
5 . meh

the benchmark is only using one card. and so you must enable sli through the nvidia control panel, as well as set valley to use both cards.

tadashisensei · Feb 9, 2014

hdshatter :

Yes sir.

Brantyn Gerik · Feb 9, 2014

6. up to date non-beta drivers, this one is important

tadashisensei · Feb 9, 2014

It was working fine about a few days ago i just saw it today.

hdshatter · Feb 9, 2014

Do you have any power saving features turned on inside windows?

tadashisensei · Feb 9, 2014

Brantyn Gerik :

hdshatter :

Nope its on High Performance

tadashisensei · Feb 9, 2014

hdshatter :

Yes

hdshatter · Feb 9, 2014

What is your CPU, power supply and how much ram do you have.

tadashisensei · Feb 9, 2014

hdshatter :

Ok, I'm on NON beta drivers now and i still have the same issue.

Brantyn Gerik · Feb 9, 2014

try each card individually. this will let you know whether or not it is a card specific problem, otherwise it may be a motherboard or psu problem

tadashisensei · Feb 9, 2014

hdshatter :

cpu: Fx-8320 OC 4.0 gz

PS: 850w xfx something

ram 16gb DDR3

tadashisensei · Feb 9, 2014

Brantyn Gerik :

I have already done this and i have no issues with ether card nor pci-e

hdshatter · Feb 9, 2014

Have you tried anything else besides Valley? Your stuffs good enough it shouldn't be bottlenecking your 780s.

tadashisensei · Feb 9, 2014

hdshatter :

Yes i hoped on bf4 and had the same issue (2nd card on idol) i think it might be my bridge not sure yet

boju · Feb 10, 2014

Try this first, under 3D global settings choose 'Single display performance mode' under 'Multi-display/Mixed-GPU acceleration. Also, make sure you choose the 'Prefer maximum performance' option under 'Power Management Mode

If that doesn't work try powering down and remove the SLI bridge.

Power back on, boot to windows and let the driver do whatever it does and then shut down/power down. Check your power connectors are firmly in place as well and the cards are in the slot correctly. Insert the sli bridge back.

boju · Feb 10, 2014

Checking for motherboard bios updates for incompatibility fixes and also switching cards around are other things to try.

tadashisensei · Feb 10, 2014

boju :

WORKED i did the 1st part you said and it fixed it ;D

boju · Feb 10, 2014

Cool

Which did the trick the single display, prefer max performance or both?

tadashisensei · Feb 10, 2014

boju :

I dono i just did both

boju · Feb 10, 2014

haha ok no worries.

tadashisensei · Feb 10, 2014

boju :

I sent u a gift make sure you use it!!!

boju · Feb 10, 2014

Wow thanks man that was a surprise.

Oh and

https://www.youtube.com/watch?v=9_-NfKakS6A

SLI - Why isn't my second card doing much?

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