Weird 2xSLI GTX780 performance?

[Dojjan]

System:

 

Intel 4790K, delided, LiquidPro on dye and IndigoXtremeXS on IHS and a CoolerMaster Nepton 280L

ASUS Z97-WS

2xASUS GTX780 STRIX 6GB graphics cards on air, running skyn3t-Asus-780-STRIX-OC 80.80.58.00.19 BIOS 32GB

G-Skill 2.66K MHz memory

 

Getting these numbers approximately regardless if running 1x or 2x cards in the system ...

 

 

[ShadowCaptain]

Forget synthetic benchmarks, maybe that particular benchmark is not using the second card

 

Is the same happening in games?

[Toddwjp]

car temps, cpu temps?

 

 

Forget synthetic benchmarks, maybe that particular benchmark is not using the second card

 

Is the same happening in games?

 

 

 

heaven supports sli, try that

 

you remember to turn it on in nvidia settings (although even with one card that would be low)

[Thecrazyswede]

System:

 

Intel 4790K, delided, LiquidPro on dye and IndigoXtremeXS on IHS and a CoolerMaster Nepton 280L

ASUS Z97-WS

2xASUS GTX780 STRIX 6GB graphics cards on air, running skyn3t-Asus-780-STRIX-OC 80.80.58.00.19 BIOS 32GB

G-Skill 2.66K MHz memory

 

Getting these numbers approximately regardless if running 1x or 2x cards in the system ...

 

Thermal throttling ?

[Dojjan]

Forget synthetic benchmarks, maybe that particular benchmark is not using the second card

 

Is the same happening in games?

Watching Unigine Valley run, it's kinda uneven in speed, not, jerky, but like an oldschool bike light going up and down in speed kinda smoothly, mostly.

 

Could it be the PLX chip mucking things up or selection PCIe slot/s? Right now I m running just one card in the first slot and the unevenness is less but still very noticeable.

[Toddwjp]

Watching Unigine Valley run, it's kinda uneven in speed, not, jerky, but like an oldschool bike light going up and down in speed kinda smoothly, mostly.

 

Could it be the PLX chip mucking things up or selection PCIe slot/s? Right now I m running just one card in the first slot and the unevenness is less but still very noticeable.

 

 

post your tempratures for cpu and gpu, or just tell us if it was thermal throttling

[Dojjan]

Thermal throttling ?

no, temps are contained within 57C-60C

[Thecrazyswede]

no, temps are contained within 57C-60C

 

I just ran my Reference 780's at 1200 mhz and 3200 on the memory and i get around 4910 points with same settings, re-flash to stock BIOS and try again, i had issues with my reference 780's when i flashed them as well.

[Toddwjp]

no, temps are contained within 57C-60C

 

 

try some in game benchmarks, if its only synth that doesnt perform then its not too bad

[DildorTheDecent]

GPU-Z says SLi is disabled. Maybe just maybe, ending it may give you a boost in performance.

Or it may burn your house down.

[BaSkA]

Or it may burn your house down.

 

No big deal.

[LemonSpice]

microstutter?

[Dojjan]

try some in game benchmarks, if its only synth that doesnt perform then its not too bad

The bicycle light-effect isnt showing in game, but I m definately getting FPS hits from time to time and kind of a raw framerate feeling in general. Not a slick, smooth framerate that I would expect from a game with a couple of years under the belt like Tribes Ascend, which really isnt that fancy to begin with either, graphics wise.

 

From most recent Unigine Valley run with just one card in top slot:

[Toddwjp]

only thing i can suggest is returning to default bios and testing again,

[BiG StroOnZ]

Did you try benching them before flashing to the skyn3t bios?

[Dojjan]

Did you try benching them before flashing to the skyn3t bios?

typically a few frames (1-5) better average with stock bios

[BiG StroOnZ]

typically a few frames (1-5) better average with stock bios

 

What have you tried so far? In a list format would be helpful. 

[Dojjan]

What have you tried so far? In a list format would be helpful. 

I'm not that very methodical about this.

 

On stock bios with no overclock, unigine runs the smoothest for me with less changing video flow speed. It s still very noticeable  and min fps is like 3.6 and average 30+ something with a 1400 unigine score. Thats in SLI! Checking around the net it looks more like I should be atleast twice that score.

 

I did try overclocking two gpu s in sli on stock bios before skyn3t using Afterburner. No core voltage adjustment obviosuly, but got it to around +250 core clock wihtout unigine acting up. Terrible video flow, randomly changing video speed, at times really jerky, especially in the fades between sceenes where you d think it gotten stuck at times.

 

With skyn3t bios I bumped vcore to 1,2 and could up core clock to +400 without unigine acting up. Video flow speed change now even more noticeable with scene fades very rugged.

 

Now I m back on stock bios with no overclock, stumped at the abysmal performance. Tribes Ascend looks and plays pretty much the same as with my HD5770 and the system, OS and boot times etc feels not much more responsive than my old q6600 2.4GHz with 4gb ddr3 and a HD5770. Only difference is that rig set me back a few hundred while this one took $3k

 

Oh well.

[BiG StroOnZ]

I'm not that very methodical about this.

 

On stock bios with no overclock, unigine runs the smoothest for me with less changing video flow speed. It s still very noticeable  and min fps is like 3.6 and average 30+ something with a 1400 unigine score. Thats in SLI! Checking around the net it looks more like I should be atleast twice that score.

 

I did try overclocking two gpu s in sli on stock bios before skyn3t using Afterburner. No core voltage adjustment obviosuly, but got it to around +250 core clock wihtout unigine acting up. Terrible video flow, randomly changing video speed, at times really jerky, especially in the fades between sceenes where you d think it gotten stuck at times.

 

With skyn3t bios I bumped vcore to 1,2 and could up core clock to +400 without unigine acting up. Video flow speed change now even more noticeable with scene fades very rugged.

 

Now I m back on stock bios with no overclock, stumped at the abysmal performance. Tribes Ascend looks and plays pretty much the same as with my HD5770 and the system, OS and boot times etc feels not much more responsive than my old q6600 2.4GHz with 4gb ddr3 and a HD5770. Only difference is that rig set me back a few hundred while this one took $3k

 

Oh well.

 

You're probably not going to like to hear this, but have you tried reinstalling Windows? That's what I would try.

[revl8er]

Maybe uninstall drivers and reinstall.  Also have you tried running from each card separately to make sure they both are actually working?  Also could be a bad sli bridge.

[hiyayhi]

GPU-z says that SLI is disabled, I don't want to seem like a downer buuuut, have you tried flicking the switch in the Geforce drivers to turn SLI on?

[connorpiper]

Forget synthetic benchmarks, maybe that particular benchmark is not using the second card

 

Is the same happening in games?

 

Unigine Benchmark supports Quad SLI and CF.

 

LTT has a thread for it: http://linustechtips.com/main/topic/69448-unigine-valley-benchmark-scores-thread-over-200-submissions/

[ShadowCaptain]

Unigine Benchmark supports Quad SLI and CF.

 

LTT has a thread for it: http://linustechtips.com/main/topic/69448-unigine-valley-benchmark-scores-thread-over-200-submissions/

 

I know it does, but I would not use synths to measure the performance of my PC

 

But maybe thats just me

[connorpiper]

I know it does, but I would not use synths to measure the performance of my PC

 

But maybe thats just me

 

It's always fun though to see who can overclock the right things to get the highest score.

[ShadowCaptain]

It's always fun though to see who can overclock the right things to get the highest score.

 

If you are into that