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Quote:
Originally Posted by TickleMeElmo View Post

A 580 does not saturate 16 lanes of PCI-E. The difference between a 16x slot and 8x slot would be less than 2 percent. However, as I understand it plugging a PCI-E 2.0 card into a 8x 3.0 slot would not yield any benefit.
Didn't mean to sound condescending. Just trying to thoroughly explain why pragmatically a sound card could not possibly need more than one lane of PCI-E to operate without issue.
The PCI-E controllers responsible for graphics cards are on the CPU itself, the chipset doesn't have many lanes at all. I didn't mean to imply that they are somehow getting more bandwidth out of the same lane, it's just perhaps things like latency drop and small inefficiencies make up for the lower bandwidth of a 8x slot.
As it stands if you use a P67 board with 1 GTX580 the GTX580 will get 16 lanes of bandwidth and the sound card will get 1 through the chipset.
If you plug in 2 GTX580s the cards will get 8 each and the sound card will get 1 through the chipset.
If you have 3 GTX580s it becomes fairly messy and it may be worth it to invest in X79 and/or a board with NF200 chips to multiplex the PCI-E lanes.

Alright, thank you. I am not trying to sneak more performance out of my card, just making sure that if I decide to upgrade I won't notice any drop in performance from the 580. smile.gif

Thanks a ton for the good explanations, I learned a lot.
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Dream Machine
(21 items)
 
 
My laptop
(10 items)
 
CPUMotherboardGraphicsRAM
Intel i7 4790K ASUS Maximus VI Hero EVGA GTX780Ti 16GB G.Skill Trident X 
Hard DriveCoolingCoolingCooling
Samsung EVO 500GB EK Supremacy EK GTX780Ti block Alphacool NexXxoS XT45 420 
CoolingCoolingOSMonitor
Alphacool NexXxoS UT60 280 x8 Noctua NF-A14 PWM fans Windows 10 64-bit BenQ XL2430T 
MonitorKeyboardPowerCase
BenQ XL2420T Realforce Tenkeyless 45g Corsair AX860i Corsair 750D 
MouseMouse PadAudio
Logitech G Pro Logitech G640 Sennheiser Game One 
CPUMotherboardGraphicsRAM
Core i7 920 D0 @ 4.2GHz Gigabyte GA-X58A-UD3R rev. 2 EVGA GeForce GTX 580 6GB DDR3 OCZ Platinum @ 1600 6-8-6-24 1T 
Hard DriveHard DriveCoolingOS
Crucial C300 Samsung HDD Noctua NH-D14 with 3 NF-P14 fans Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
BenQ XL2420T Realforce 87UB Corsair HX850W HAF-X 
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Intel 3610QM N56VZ NVIDIA GT650M 2GB 8GB 
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