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What is the best Z77 Mobo that will let me run tri fire + sound card ? - Page 2

post #11 of 51
Quote:
Originally Posted by invincible20xx View Post

but i heard the limitation comes from the cpu 3770k itself because it has a limited number of lanes ?!

The Socket 1155 CPU only has 16 PCIe lanes, no matter what motherboard you use. The PLX PCIe equipped boards usually have 8x lanes for the top PCie x16 slot, and then switch the other 8x lanes out to the other slots in a FIFO order, so the boards that need the bandwidth will get "up to" 8x lanes on demand.

The Socket 2011 boards (X79) have 40 native PCie 3.0 lanes, and there are even some of those with PLX or dual PLX chips (look up ASRock Extreme 11) that can give you up to 7 PCIe x16 slots each with x16 lanes. The PLX chips divide those 40 PCie lanes out to whichever cards need the bandwidth the most. Downside is the PLX chips always introduce some amount of latency. In my opinion, those X79 boards with PLX chips are better off used with GPU Compute-intensive (e.g. CUDA computation) tasks where there's a crap ton of GPU to CPU communication. For gaming, a non-PLX board is fine, as they will provide 8x-8x-8x-8x in 3.0 for quad-capable boards, or 16x-8x-16x in 3.0 for tri-capable boards.

My professional advice is that if you already have a Z77 board, stick with two GPU and forget about Tri-Fire or Tri-SLI until you're willing to invest in a top of the line board with PLX switches, or an X79 board with more lanes.

Greg
Edited by hammong - 4/3/13 at 9:59pm
post #12 of 51
Thread Starter 
Quote:
Originally Posted by hammong View Post

The Socket 1155 CPU only has 16 PCIe lanes, no matter what motherboard you use. The PLX PCIe equipped boards usually have 8x lanes for the top PCie x16 slot, and then switch the other 8x lanes out to the other slots in a FIFO order, so the boards that need the bandwidth will get "up to" 8x lanes on demand.

The Socket 2011 boards (X79) have 40 native PCie 3.0 lanes, and there are even some of those with PLX or dual PLX chips (look up ASRock Extreme 11) that can give you up to 7 PCIe x16 slots each with x16 lanes. The PLX chips divide those 40 PCie lanes out to whichever cards need the bandwidth the most. Downside is the PLX chips always introduce some amount of latency.

My professional advice is that if you already have a Z77 board, stick with two GPU and forget about Tri-Fire or Tri-SLI until you're willing to invest in a top of the line board with PLX switches, or an X79 board with more lanes.

Greg

i see it's just that i have 3 7970's already, one of them is in another rig that i don't play games on so i was thinking maybe i could take that 3rd 7970 and put it in my main rig to benefit from it in gaming
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Zero Ex 2
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post #13 of 51
Quote:
Originally Posted by hammong View Post

The Socket 1155 CPU only has 16 PCIe lanes, no matter what motherboard you use. The PLX PCIe equipped boards usually have 8x lanes for the top PCie x16 slot, and then switch the other 8x lanes out to the other slots in a FIFO order, so the boards that need the bandwidth will get "up to" 8x lanes on demand.

The Socket 2011 boards (X79) have 40 native PCie 3.0 lanes, and there are even some of those with PLX or dual PLX chips (look up ASRock Extreme 11) that can give you up to 7 PCIe x16 slots each with x16 lanes. The PLX chips divide those 40 PCie lanes out to whichever cards need the bandwidth the most. Downside is the PLX chips always introduce some amount of latency. In my opinion, those X79 boards with PLX chips are better off used with GPU Compute-intensive (e.g. CUDA computation) tasks where there's a crap ton of GPU to CPU communication. For gaming, a non-PLX board is fine, as they will provide 8x-8x-8x-8x in 3.0 for quad-capable boards, or 16x-8x-16x in 3.0 for tri-capable boards.

My professional advice is that if you already have a Z77 board, stick with two GPU and forget about Tri-Fire or Tri-SLI until you're willing to invest in a top of the line board with PLX switches, or an X79 board with more lanes.

Greg

I have to agree with him Unless you are going for the $300+ dollar boards, The diminishing returns of 3x gpu's is very high.

The scaling gets a lot worse

Your CFX/SLI issues will be more apparent.

Its a huge headache. imo.
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post #14 of 51
Thread Starter 
Quote:
Originally Posted by KuuFA View Post

I have to agree with him Unless you are going for the $300+ dollar boards, The diminishing returns of 3x gpu's is very high.

The scaling gets a lot worse

Your CFX/SLI issues will be more apparent.

Its a huge headache. imo.

but what if i have the 3rd 7970 already still not recommending to just use it in that 4x 2.0 slot ?! redface.gif
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post #15 of 51
If you get a G1 Sniper 3 you will Tri fire @ 8x16x8 And you can sell your sound card... G1 Sniper 3 has one onboard that is pretty nice.

This one

    
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post #16 of 51
Don't run crossfire till the issues are fixed. Doing so spending all that money on the other cards wont gain you much other then a lot of microstuttering on a lot of games.
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post #17 of 51
The x4 2.0 slot is going to bottleneck the third board.

You can certainly try it, but you might find two boards at x8 x8 run faster than three boards at x8 x4 x4. As KuuFA said, scaling with three boards is already bad enough - and that's under proper x8 x8 x8 PCie 3.0 conditions.

Greg
post #18 of 51
Quote:
Originally Posted by MxPhenom 216 View Post

Don't run crossfire till the issues are fixed. Doing so spending all that money on the other cards wont gain you much other then a lot of microstuttering on a lot of games.

...

Not everybody has these issues i for one do not...

FC3 is FC3 needs an update for Amd cards...
    
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post #19 of 51
dbl lag post
    
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post #20 of 51
Ditch the sound card and get a nice external DAC if you really need the board real estate.
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