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post #61 of 63
Quote:
Originally Posted by sonarctica View Post

PLX?

It's an integrated circuit technology that utilizes switching to offer "more" PCIe lanes. Here is a decent Anandtech article from this time last year talking about it.
Warning: Spoiler! (Click to show)
With only sixteen PCIe 3.0 lanes available on a Z77 motherboard paired with an Ivy Bridge CPU, when we get to three or four-way GPU solutions these GPUs are itching to get more bandwidth. The Z77 specification limits us to three GPUs anyway, at x8/x4/x4. For some extra cost on the motherboard, we can add in a PLX PEX 8747 chip that effectively increases our PCIe 3.0 lane count, giving 32 PCIe 3.0 lanes overall.

From what I understand, while the mainstream non-PLX Z77 motherboards support a maximum of 16 PCIe 3.0 lanes (w/IVB cpus), X79 motherboards can support 48 PCIe lanes w/SB-E CPUs. I'm assuming that once IB-E is released these 48 lanes will be PCIe 3.0 also. Having only 16x PCIe 3.0 lanes limits the number of lanes for multi GPU setups, so manufacturers include the PLX PEX 8747 chip (or some other variant I guess), to emulate more lanes by switching. At least, this is how I understood it. My guess is this undoubtedly isn't as optimized as actually having more lanes, and probably presents some adverse effects, perhaps latency issues at the very least based on the diagram. This is why I said that if I knew that I wanted a multi-card setup (2+) from the get go, I would have purchased an X79 platform. I also like how they will be releasing an i7-4820k(?) which will bring unlocked affordable quad-cores to the X79 platform.

I did recently run into this motherboard, and was blown away at how they combined PLX with an X79 platform. Using an SB-E it allows for 64 PCIe lanes! They were able to include x16/x16/x16/x16 PCIe socket system WITH a built in LSI RAID controller. Technology moves so damn fast, biggrin.gif

I hope that answers your question. And again, correct me if I'm wrong smile.gif
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Kid Dynomite
(41 items)
 
Black Dynamite
(39 items)
 
 
CPUMotherboardGraphicsGraphics
Intel Core i7-5960x J513B135 @4.5GHz (1.264V) ASRock X99M Extreme4 Nvidia GTX 1080 FE Nvidia GTX 1080 FE 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance LPX 64GB (4x16GB) DDR4 DRAM 2... Samsung 950 PRO M.2 512GB (MZ-V5P512BW) Samsung 850 Pro 1TB x2 RAID0 WD Caviar Purple 6TB x2 
Hard DriveHard DriveOptical DriveCooling
Seagate 2TB ST32000542AS  Seagate ST4000LM016 4TB 2.5" x2 (FP58) Sony BD-5850H w/Silverstone FP58 PrimoChill PrimoFlex Advanced LRT Tubing 1/2"ID... 
CoolingCoolingCoolingCooling
8x Barrow 1/2"ID x 3/4"OD Compression Fittings 2x Barrow 3/8"ID x 1/2"OD Compression Fittings 3x Barrow 40mm g1/4 Extenders 1x Barrow 30mm g1/4 Extender 
CoolingCoolingCoolingCooling
1x Barrow 20mm g1/4 Extender 5x Barrow 90-degree g1/4 Single Rotary Koolance RP-401X2 Rev 1.1 PrimoChill PrimoFlex Advanced LRT Tubing 3/8"ID... 
CoolingCoolingCoolingCooling
Silverstone AP181 180mm Fan Scythe GentleTyphoon D1225C12B5AP-15 2x Swiftech MCP35X Koolance 380i 
CoolingCoolingCoolingOS
2x EK-FC1080 GTX Nickel+Acetal Phobya Xtreme 200mm Radiator Rev 2 Alphacool NexXxoS UT60 Full Copper 120mm Windows 10 Enterprise Build 1607 
MonitorMonitorKeyboardPower
2x Crossover 324K w/Workrite Monitor Mounts Vizio 49" 4K M49-C1 Corsair K95 Cooler Master V1000 
CaseMouseMouse PadAudio
Silverstone TJ08B-E Razer Deathadder 2013 Corsair Gaming MM300 Grace Design m9xx DAC/Amplifier 
AudioAudioAudioAudio
Audeze LCD-X Fostex TH-X00 Ebony Sennheiser HD 6XX Massdrop Limited Edition AKG K7XX Massdrop Limited Edition 
Other
Intel Dual Band Wireless-AC 7260 
CPUMotherboardGraphicsRAM
Core i7-4790k @4.8GHz (1.291V) De-Lidded Gigabyte GA-Z87X-OC Force AMD R9 290x 1075/1375 Crucial Ballistix Tactical 32GB @1600MHz 8-8-8 ... 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 512GB Samsung M8 1TB 2.5" x4 Samsung F4EG 2TB x3 Seagate SV35 2TB x2 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda LP 2TB x2 WD Caviar Green 2TB x1 Sony BD-5850H w/Silverstone FP58 Koolance 380i 
CoolingCoolingCoolingCooling
2x Swiftech MCP655B D5 Pumps XSPC M20 to G1/4" Fillport 1x Bitspower 90-degree Single Rotary 1x Bitspower 20mm g1/4 extender 
CoolingCoolingCoolingCooling
2x Bitspower 10mm g1/4 extenders 2x Bitspower D-Plug Sets (BP-MBWP-C07) 2x Bitspower 3/8"ID x 1/2"OD Compression Fittings 1x Bitspower 1/2"ID x 3/4"OD Single Rotary Comp... 
CoolingCoolingCoolingCooling
4x Bitspower 1/2"ID x 3/4"OD 45-degree Dual Rot... 3x Bitspower 1/2"ID x 3/4"OD 90-degree Triple R... 1x Bitspower 45-degree Single Rotary Koolance VID-AR290X Rev 1.0  
CoolingCoolingCoolingCooling
EK-FB GA Z87X-OC Force PrimoChill PrimoFlex Advanced LRT Tubing 3/8"ID... PrimoChill PrimoFlex Advanced LRT Tubing 1/2"ID... Magicool Extreme Triple 180mm x 35mm Slim Radiator 
CoolingOSMonitorKeyboard
Koolance RP-452X2 Rev2.0 Windows 7 Professional x64 Dell Ultrasharp 2408WFP Corsair K90 
PowerCaseMouseMouse Pad
Seasonic X-1250XM2 Silverstone FT02 (Modified) Razer Naga 2012 Sony Playstation 3 Mouse Pad 
AudioAudioOther
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post #62 of 63
3770k does not have sufficient pci-e lanes to provide the minimum of 8x pci-e 2.0 bandwidth for more than two cards, which is required to run SLI, and so a PLX chip is added to provide additional lanes to enable this. However, PLX does not add any more bandwidth to the CPU, which can introduce latency issues.
post #63 of 63
Quote:
Originally Posted by Fulvin View Post

3770k does not have sufficient pci-e lanes to provide the minimum of 8x pci-e 2.0 bandwidth for more than two cards, which is required to run SLI, and so a PLX chip is added to provide additional lanes to enable this. However, PLX does not add any more bandwidth to the CPU, which can introduce latency issues.

Thus creating bottle-necking right?

Quite a bit of good information in this thread that I had questions about myself, thanks!
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