Hardware price list/spec sheet
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the amount of bandwidth available to your cards will be less than optimal.
this will result in an upto 10% performance drop in SLI(from what you would previously get in x16/x16 mode and 5% in Single GPU.
today's best GPUs cannot fill the x16 bandwidth.
They cant even fill an x8's bandwidth, but the lanes available decreases, so it has to change the amount of data being sent via each lane, resulting in more error-prone data transfer, correcting which increases the processing time by a small amount.
this will result in an upto 10% performance drop in SLI(from what you would previously get in x16/x16 mode and 5% in Single GPU.
today's best GPUs cannot fill the x16 bandwidth.
They cant even fill an x8's bandwidth, but the lanes available decreases, so it has to change the amount of data being sent via each lane, resulting in more error-prone data transfer, correcting which increases the processing time by a small amount.
MegaMind
Human Spambot
Nope... @2560x1600 or below, an x8/x8 SLI or CFX configuration will perform the same as a x16/x8 or x16/x16 configuration.
J
Joker
Guest
negligible difference performance wise. x8 x8 is enough for two gpu sli/cfx.
@megamind:do you run CF/SLI?
I do. the performance difference is there. but you cant really notice the 5-10% difference without recording the framerates.
old cards like the 8 series, 9 series, and GT200 cannot even saturate 8x. cards like GTX 560 Ti,570,580,590,GTX470,480, which do manage to saturate x8 lanes in heavy scenes do show the difference.
I do. the performance difference is there. but you cant really notice the 5-10% difference without recording the framerates.
old cards like the 8 series, 9 series, and GT200 cannot even saturate 8x. cards like GTX 560 Ti,570,580,590,GTX470,480, which do manage to saturate x8 lanes in heavy scenes do show the difference.
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MegaMind
Human Spambot
I said you cant really notice without recording framerates 
It isnt significant, but its there :sigh:
It isnt significant, but its there :sigh:
MegaMind
Human Spambot
you cant really notice without recording framerates
Well, it cannot be noticed even with recording framerates...
Well, it cannot be noticed even with recording framerates...
Not until you increase the number of monitors.
Guys I think you better take a look at here 
*media.bestofmicro.com/6/J/284059/original/image021.png
*media.bestofmicro.com/6/K/284060/original/image022.png
*media.bestofmicro.com/6/L/284061/original/image023.png
pics courtesy of tom's hardware
Source and The Article
*media.bestofmicro.com/6/J/284059/original/image021.png
*media.bestofmicro.com/6/K/284060/original/image022.png
*media.bestofmicro.com/6/L/284061/original/image023.png
pics courtesy of tom's hardware
Source and The Article
average isnt decided by (max+min)/2, but by total no. of framerates/total no. of frames.Well, it cannot be noticed even with recording framerates...
so isnt there a performance loss if you are at minimum framerate for a longer period of time?
its a 2-4% loss for the 570/6950. expect a higher loss with 580 due to more bandwidth usage.
maybe GTX400 doesnt show it but it is there in GTX 500.I was assuming that the similar architecture allowed similar bandwidth. Clearly that is not the case according to the HardOCP article.
Skud, you linked us to an article using old cards. Nowhere have I said that the 5870 can saturate x8 lanes
As per the Toms article link tg posted: the better card (570) is taking less performance hit while moving from x16 to x8 to x4, particularly with increasing resolution. By the same, a 580 should take even lesser hit.
And in the 2nd scenario, from whatever online articles I have seen, in dual card config, it hardly matters if it's x16/x16, x16/x8, x8/x8 or even x16/x4 - the fps loss is there, but at 1080p resolution, not significant enough.
And in the 2nd scenario, from whatever online articles I have seen, in dual card config, it hardly matters if it's x16/x16, x16/x8, x8/x8 or even x16/x4 - the fps loss is there, but at 1080p resolution, not significant enough.
MegaMind
Human Spambot
But the min. framerate is also the same @/below 2560x1600 (considering SLI scenario)
*www.hardocp.com/images/articles/1282534990Cnhf3iYXfv_1_5.gif
*www.hardocp.com/images/articles/1282534990Cnhf3iYXfv_1_4.gif
*www.hardocp.com/images/articles/1282534990Cnhf3iYXfv_1_3.gif
The link given by Topgear is of single GPU scaling @ diff. bandwidth ... And the talk here is about SLI...
@Extreme Gamer, can u provide any source/link which says x16x16 vs x8x8 has considerable performance(framerate) diff. ??
I couldn't get one point: people buying cards to play games or record framerates? If there's no difference of gameplay experience, do we really need to be bothered about x16/x8/x4 or any other thing for that matter?
As long as the gameplay is fluid at the highest settings, nothing else matters.
As long as the gameplay is fluid at the highest settings, nothing else matters.
@Megamind: read my whole post:
I said that the performance decrease is there, but I never said it is considerable.10% isnt very comprehensible. 480s in SLI spit a lot of FPS, so at the upper levels, after ~120fps you cant really notice
There was a post by a guy named Discordia at the nvidia forums who runs 580s. I dont remember topic name so have been unsuccessful in finding it so far
I assure you that I did search for it, but the post was made many months ago.
@Skud: I was referring to %age performance drop. obviously it will be faster than 570.
I said that the performance decrease is there, but I never said it is considerable.10% isnt very comprehensible. 480s in SLI spit a lot of FPS, so at the upper levels, after ~120fps you cant really notice
There was a post by a guy named Discordia at the nvidia forums who runs 580s. I dont remember topic name so have been unsuccessful in finding it so far
I assure you that I did search for it, but the post was made many months ago.
@Skud: I was referring to %age performance drop. obviously it will be faster than 570.