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Question for all the GPU Einsteins of the world ( delves into mobos too ) Why put the gpu into the first PCIE slot as reccomended by mobo manufacture?

post #1 of 3
Thread Starter 
it has come up and been asked in another thread that i visit

does it matter which slot assuming both are PCIE2.0/3.0 x16 you use for a single GPU pc. ( on the same motherboard )

i have always assumed the manufacture of the board ( i have owned several brands and all with multiple pcie slots have said this ) is right, when in their manual it clearly states, when using a single gpu use "this"pcie slot for best performance.


i also have been under the impression through my limited research and knowledge that the difference is in latency and although extremely minute there is a small difference.

am i wrong? is there any proof to this?

any help and or evidence would be extremely helpful, as now i am more curious to this fact.
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AMD FX-8350 Gigabyte 990FXA-UD7 R7970-2PMD3GD5/OC  R7970-2PMD3GD5/OC  
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R7970-2PMD3GD5/OC  R7970-2PMD3GD5/OC  F3-2400C10D-16GTX  OCZ Agility 3 120GB  
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OCZ Agility 3 120GB  Seagate Barracuda 1TB  Segate Barracuda 3TB Rosewill RCR-IM5001 USB2.0 75 in 1 internal Car... 
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Pioneer BDR-208DBK Blu-ray Writer Swiftech H20-220 EDGE HD Liquid Cooling Kit Swiftech Komodo 7970 Swiftech MCP-35X2 
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Swiftech MCP35X2 Heat Sink Swiftech MCP35X Reservoir Swiftech Komodo 7970 Swiftech Komodo 7970 
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Alphacool 240mm XT45 Alphacool 120mm XT45 Alphacool 120mm UT60 FrozenQ PC Mods UV Meteor Light Limited Edition... 
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Koolance Radiator Mounting Bracket with Quick-R... Swiftech Komodo 7970 Windows 7 Windows 8  
MonitorMonitorMonitorMonitor
ASUS VG248QE Black 24" 144Hz 1ms  ASUS VG248QE Black 24" 144Hz 1ms  ASUS VG248QE Black 24" 144Hz 1ms  XFX FXTRISTAND Triple Display Monitor Stand  
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Pioneer BDR-208DBK Rosewill RCR-IM5001 USB2.0 75 in 1 internal Car... Swiftech MCP-35X White Top Swiftech Quiet Power 240  
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CPUMotherboardGraphicsRAM
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post #2 of 3
Since latency differences between slots would be on the order of trillionths (1x10^-12) of a second, I would assume the manufacturer specifies which slot to use simply because his BIOS defaults to that one.
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post #3 of 3
Quote:
Originally Posted by Mega Man View Post

does it matter which slot assuming both are PCIE2.0/3.0 x16 you use for a single GPU pc. ( on the same motherboard )

Assuming both are x16, no. However some mobos have the PCIe slot furthest from the CPU run at x4 instead of x16, like mine. Make sure your GPU is in the x16 slot, and if they're both x16, just put it in a place with good airflow.
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Overclock.net › Forums › Graphics Cards › Graphics Cards - General › Question for all the GPU Einsteins of the world ( delves into mobos too ) Why put the gpu into the first PCIE slot as reccomended by mobo manufacture?