Solved PCI-e Lanes

Lady Fitzgerald

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On my ASUS P9X79 WS, the top PCI-e slot (blue) has x16 assigned to it. It is paired with a black slot below it. If run a GPU card in the top blue slot and nothing in the black slot, the card will run on x16. If I put GPU cards in both the top blue slot and the black one below it, both will run at only x8. What I'm wondering is what would happen if I had a GPU in the blue slot and a x8 card in the black slot? Would the GPU still drop to x8?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 7 Ultimate 64 bit
CPU
Intel i7-3930K
Motherboard
ASUS P9X79 WS
Memory
Kingston HyperX Genesis 32GB Kit (8x4GB Modules) 1600MHz DDR
Graphics Card(s)
MSI R7850 Twin Frozr 2GD5/OC Radeon HD 7850 2GB 256-bit GDDR
Sound Card
Asus Xonar Essence STX
Monitor(s) Displays
3x Asus VG248QE 24", Vizio 32" TV
Screen Resolution
1920 x 1080, ?
Hard Drives
Samsung 128GB 840 Pro SSD (1),
Samsung 4TB 850 EVO SSDs (4)
Samsung 4TB 850 EVO SSDs (16) external backup drives used in 2.5" hot swap bays in the computer.
PSU
Corsair HX750w
Case
Antec Two Hundred v2 (modified)
Cooling
Cooler Master GeminII S524 120mm (fan replaced with a 140mm)
Keyboard
Logitech G510s
Mouse
Logitech M525 (two in use)
Internet Speed
=< 32Mbps down, 8Mbps up
Antivirus
AVAST!, MBAM, SAS, Spybot S&D (all but MBAM free) Glary Util
Browser
IE11
Other Info
LSI 9211-8i HBA card (8 SATA III ports), 2.5" & 3.5" Hot Swap Bays, HooToo HT-CR001 PCI-E to USB 3.0 Internal Hub + 6 Slot Card Reader, and LG Model CH12LS28 BD-ROM Optical Drive. Also, ScanSnap S1500 ADF duplexing scanner, Canon 9000F flat bed scanner, Corsair SP2500 2.1 speakers, Samsung CLP 415nw laser color printer, Cyberpower PP2200SW UPS
When you have 2 cards they will run at 8x regardless where they are.

I'm assuming you mean another video card, if not, you'll have to clarify.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Skylake Special #666
OS
Windows 10 Pro x64
CPU
Intel Core i7 6700K
Motherboard
Asus Sabertooth Z170 Mark 1
Memory
GSkill TridentZ RGB 16GB 3600 16-16-16-36
Graphics Card(s)
EVGA GTX 980 Ti SC x2
Sound Card
Realtek High Definition
Monitor(s) Displays
AOC G2460PG
Screen Resolution
1920 x 1080 144Hz
Hard Drives
Samsung 860 Pro 256GB, Seagate Barracuda 4TB x2
PSU
EVGA 1000 P2, EVGA White Custom Braided Cables
Case
Corsair Vengeance C70 Gunmetal Black
Cooling
Corsair H100i v2, Corsair ML120 x2, Thermal Grizzly Kryonaut
Keyboard
Logitech G910 Orion Spectrum
Mouse
Logitech G700s
Internet Speed
Verizon Fios Quantum Gateway 75/75
Antivirus
Windows Defender, Malwarebytes Free 3.8.3
Browser
Chrome
Other Info
Corsair SP120 x4, LG Blu-ray Drive, Durabrand HT-395 100 Watt Dolby Digital Amp, Corsair H2100 Wireless 7.1 Headset
Thanks!
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 7 Ultimate 64 bit
CPU
Intel i7-3930K
Motherboard
ASUS P9X79 WS
Memory
Kingston HyperX Genesis 32GB Kit (8x4GB Modules) 1600MHz DDR
Graphics Card(s)
MSI R7850 Twin Frozr 2GD5/OC Radeon HD 7850 2GB 256-bit GDDR
Sound Card
Asus Xonar Essence STX
Monitor(s) Displays
3x Asus VG248QE 24", Vizio 32" TV
Screen Resolution
1920 x 1080, ?
Hard Drives
Samsung 128GB 840 Pro SSD (1),
Samsung 4TB 850 EVO SSDs (4)
Samsung 4TB 850 EVO SSDs (16) external backup drives used in 2.5" hot swap bays in the computer.
PSU
Corsair HX750w
Case
Antec Two Hundred v2 (modified)
Cooling
Cooler Master GeminII S524 120mm (fan replaced with a 140mm)
Keyboard
Logitech G510s
Mouse
Logitech M525 (two in use)
Internet Speed
=< 32Mbps down, 8Mbps up
Antivirus
AVAST!, MBAM, SAS, Spybot S&D (all but MBAM free) Glary Util
Browser
IE11
Other Info
LSI 9211-8i HBA card (8 SATA III ports), 2.5" & 3.5" Hot Swap Bays, HooToo HT-CR001 PCI-E to USB 3.0 Internal Hub + 6 Slot Card Reader, and LG Model CH12LS28 BD-ROM Optical Drive. Also, ScanSnap S1500 ADF duplexing scanner, Canon 9000F flat bed scanner, Corsair SP2500 2.1 speakers, Samsung CLP 415nw laser color printer, Cyberpower PP2200SW UPS
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