When frames take longer to render, there's more input lag. Pretty much everybody who's tried 120hz monitors are noticing and applauding a mere 8ms improvement in input lag against 60hz. Doubling the framerate from 30 to 60 cuts the lag down by 16ms.
"Tens of milliseconds" makes the difference between unnoticeable and barely playable between my 20ms and 50ms TV's.
"Tens of milliseconds" is much more than the extra 16ms of lag Triple Buffering induces at 60hz and many people complain about that. This "tens of milliseconds" is added on top of one extra frame of lag, 16ms at 60hz, for just having dual-GPU AFR rendering.
From a subjective point of view, the difference between SLI and no SLI in terms of input lag is very apparent to me. SLI feels considerably more floaty in terms of mouse response.
Valtteri already summed the most important things it seems
in the other thread, you experienced the same sort of input-lag with Xfire 4800s, so that would indicate to me the metering is not the cause of the lag you were experiencing. I don't think it would add any significant lag at all, unless performance drops significantly, and then as the article at Techreport says, it could compound the issue, making it worse.
Last edited by icemanchilled; 05-02-2012 at 03:48 PM.
Fair enough. Yes, the actual amount from this metering remains open.
There is proof about the fact it adds lag, only thing without proof is how much, and nVidia at least didn't see need to correct TechReports "up to tens of milliseconds" estimate
Have a mercy CB, not again.
Last edited by dragomirc; 05-02-2012 at 05:47 PM.
I think Techreport is insane for calling tens of milliseconds not noticeable.
If the "tens" was 30 or even just 20, it probably wouldn't be noticeable - but when you account your monitor, AFR introduced lag and possibly mouse etc too, you're "quite a bit" higher than that 20.
Also, the metering IIRC is used regardless if you use SLI or not.