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Help me choose between these two Tri-Sli boards, please! - Page 3

post #21 of 22
Quote:
So, if you were to choose to use the CPU directly on the MVE for tri-SLI, wouldn't you be short lanes for all three cards? (Using an i7 2600k)

Exactly, or any other board that allows slot switching, or just doesn't have PLX. For example my UD5H uses all 16 lanes from CPU directly for 3 PCI-E x16 slots. That means if all 3 are populated they will run at X8/X4/X4 at 3.0. That's pretty good for 3-way Crossfire, but you won't be able to enable 3-way SLI at all.

With MVE you just keep PLX enabled for any SLI config.

I haven't talked about PLX for a while, so I might forgotten some things, but basically PLX has 32 lanes that it shares between GPUs. So GPUs communicate with PLX first, and then PLX communicates with CPU.

So there is an extra chip between GPUs and the CPU. That's where the latency comes from. It's a latency in communication between GPU and CPU. I am not sure if it will result in any of the problems that you listed above, but It isn't huge; otherwise, manufacturers wouldn't use it, but for 1 GPU configs performance in benchmakrs slightly drops. For several GPU configs, the performance is usually better than directly to the CPU.

Here are the benches.
Ivy Bridge
(21 items)
 
Ryzen
(5 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Gigabyte GA-Z77X-UD5H EVGA Geforce GTX 780 Classified Crucial Ballistix Sport 2x8GB 1600Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 830 Western Digital WD1001FALS Samsung HD753LJ ST3300822AS 
Hard DriveCoolingCoolingOS
Western Digital RED 3 TB Custom Loop Lamptron FC Touch Windows 8.1 update 1 Professional 
MonitorKeyboardPowerCase
Dell P2414H CM Storm Quickfire Rapid Red EVGA G2 1000W Cooler Master Cosmos II 
MouseMouse PadAudioAudio
Logitech G502 Logitech G240 Beyerdynamic DT 880 Premium 600 OHM Schiit Valhalla 
Audio
M-Audio AV40 
  hide details  
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Ivy Bridge
(21 items)
 
Ryzen
(5 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Gigabyte GA-Z77X-UD5H EVGA Geforce GTX 780 Classified Crucial Ballistix Sport 2x8GB 1600Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 830 Western Digital WD1001FALS Samsung HD753LJ ST3300822AS 
Hard DriveCoolingCoolingOS
Western Digital RED 3 TB Custom Loop Lamptron FC Touch Windows 8.1 update 1 Professional 
MonitorKeyboardPowerCase
Dell P2414H CM Storm Quickfire Rapid Red EVGA G2 1000W Cooler Master Cosmos II 
MouseMouse PadAudioAudio
Logitech G502 Logitech G240 Beyerdynamic DT 880 Premium 600 OHM Schiit Valhalla 
Audio
M-Audio AV40 
  hide details  
Reply
post #22 of 22
Thread Starter 
Quote:
Originally Posted by DeXel View Post

Exactly, or any other board that allows slot switching, or just doesn't have PLX. For example my UD5H uses all 16 lanes from CPU directly for 3 PCI-E x16 slots. That means if all 3 are populated they will run at X8/X4/X4 at 3.0. That's pretty good for 3-way Crossfire, but you won't be able to enable 3-way SLI at all.

With MVE you just keep PLX enabled for any SLI config.

I haven't talked about PLX for a while, so I might forgotten some things, but basically PLX has 32 lanes that it shares between GPUs. So GPUs communicate with PLX first, and then PLX communicates with CPU.

So there is an extra chip between GPUs and the CPU. That's where the latency comes from. It's a latency in communication between GPU and CPU. I am not sure if it will result in any of the problems that you listed above, but It isn't huge; otherwise, manufacturers wouldn't use it, but for 1 GPU configs performance in benchmakrs slightly drops. For several GPU configs, the performance is usually better than directly to the CPU.

Here are the benches.

AH! Again, very informative; thank you!

I'm still unsure of which one to choose, but I'll figure it out eventually. I'm leaning more towards the Gigabyte.
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