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would a 2500K, PCI-E 2.0 8x/8x limit 2 980Ti in SLI? - Page 2

post #11 of 17
Thread Starter 
Quote:
Originally Posted by drBlahMan View Post
 
Quote:
Originally Posted by juano View Post

The CPU speed itself should be fine in the vast majority of cases, but I would imagine that there will be a small performance hit from PCIe 2 x8/x8 versus PCIe3 x16/x16 but I don't think I would be too concerned about it. If I were in your shoes I would get another 980ti whenever you feel like it, but not upgrade your CPU/mobo till Skylake(get one with HT this time)/Z107/DDR4 at the earliest.

On this side thumb.gif

well it would be PCIe 2.0 8x/8x vs PCIe 3.0 8x/8x or 16x/8x ... I'm under the understanding that only the mighty 5930K has enough PCIe lanes to do 16x/16x...and I'm not buying that...too much $ 

 

per the linked supply earlier http://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/21.html

 

there's about a 4-5% performance loss at 1440p and 1080p...but since a 980Ti OC can handle pretty much everything at 1440p I'd be going SLI for 4K and the performance difference is only 2% (if the 980ti tests the same)

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post #12 of 17
Quote:
Originally Posted by JONSTARKS View Post

were u overclocked at all?

Yeah, my 2600k was oced @4.5 ghz but I had stuttering in newer games only, old games were running fine, zero issues, then I upgraded to the 4790k and now all my games are working stutter free, old and new games.
post #13 of 17
Thread Starter 
Quote:
Originally Posted by Naked Snake View Post
 
Quote:
Originally Posted by JONSTARKS View Post

were u overclocked at all?

Yeah, my 2600k was oced @4.5 ghz but I had stuttering in newer games only, old games were running fine, zero issues, then I upgraded to the 4790k and now all my games are working stutter free, old and new games.

interesting, I wonder if the move to PCIe 3.0 made a difference, or maybe the move to a different chipset made the difference...any idea if your cpu was doing 100%?

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post #14 of 17
Quote:
Originally Posted by JONSTARKS View Post

interesting, I wonder if the move to PCIe 3.0 made a difference, or maybe the move to a different chipset made the difference...any idea if your cpu was doing 100%?

I think that moving to Pci 3.0 made the difference, I tried running a single gtx 970 in the 2600k and single in the 4790k and there wasn't much difference in my games.

I don't recall the exact fps right now but let's say for example that with a single Gtx 970 while playing Assasins Creed Unity in my 2600k I was getting 42 fps average @ Ultra settings 1080p and zero stturing issues and in my 4790k I was getting 45 fps average @ Ultra 1080p, everything smooth.

The problem seems to be when running SLI, that's when my 2600k was getting 60 fps @ Ultra settings 1080p but sttutering and low min fps, on the other hand my 4790k was getting 61 fps @Ultra 1080p but stuttering free and better min fps rates.

The only things I've changed in my setup is the motherboard, the processor and the ram so the problem maybe is in one of those old components, I wish I knew haha.
post #15 of 17
Quote:
Originally Posted by Naked Snake View Post

I think that moving to Pci 3.0 made the difference, I tried running a single gtx 970 in the 2600k and single in the 4790k and there wasn't much difference in my games.

I don't recall the exact fps right now but let's say for example that with a single Gtx 970 while playing Assasins Creed Unity in my 2600k I was getting 42 fps average @ Ultra settings 1080p and zero stturing issues and in my 4790k I was getting 45 fps average @ Ultra 1080p, everything smooth.

The problem seems to be when running SLI, that's when my 2600k was getting 60 fps @ Ultra settings 1080p but sttutering and low min fps, on the other hand my 4790k was getting 61 fps @Ultra 1080p but stuttering free and better min fps rates.

The only things I've changed in my setup is the motherboard, the processor and the ram so the problem maybe is in one of those old components, I wish I knew haha.

Were you using the same Nvidia driver with the 2600k & 4790k?
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post #16 of 17
Quote:
Originally Posted by drBlahMan View Post

Were you using the same Nvidia driver with the 2600k & 4790k?

Yep, I was using 345.20 drivers at that time when running the tests. I'm always up to date when it comes to my gpu drivers biggrin.gif
post #17 of 17
I have 2500K @ 4,5 GHZ on Asus Max IV Extreme and just bought 2 GTX 1070 for SLI. Alas GPU usage is just 40-60% and I'm trying to figure out what's holding me back that much. CPU usage is very low, I can't even hear two 3000 RPM fans mounted on it, so i guess it's below 40%. PSU 1000W, 4k SLI bridge.
My main suspect are 2 PCIE 2.0 x8 lanes, but could it be that serious bottleneck?
Edited by asbator - 8/24/16 at 6:31am
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