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How bad will my GPU suffer from using 8x slots on my motherboard?

post #1 of 8
Thread Starter 
Currently have an ASUS Sabertooth 990fx R2.0 with 2x XFX Double D 7850s

My first GPU covers up my PCI-E x1 slot because it is so big, I thought about leaving my 2nd GPU in the 3rd slot and putting the first GPU down in the 4th slot, but was wondering how big of a performance loss would it suffer?

Starting to think the Avermedia Live Gamer HD card isn't worth getting if my GPUs will suffer a big loss just to free up my PCI-E slot.
Gaming Machine
(19 items)
 
  
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FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
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Gaming Machine
(19 items)
 
  
CPUMotherboardGraphicsGraphics
FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
Mouse PadAudioOther
Rocketfish - Gaming Mouse Pad RAZER CARCHARIAS Bitfenix Recon 
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post #2 of 8
To give you an idea how its minimal








PCIe 3.0 vs 2.0

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3 TB Seagate OCZ Vertex 4 256GB Crucial M4 128GB ADATA SX900 128GB 
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RIVE Koolance Waterblock (VRM and PCH) Feser X-Changer 360 Feser X-Changer 240 Feser X-Changer 480 
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WaterCool MoRA3 Pro with Gentle Typhoon 3 x MCP 655 pumps (With EK top...all serial) 2 x EK FC 1080ti Blocks Windows 7 Ultimate x64 
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Asus ROG Swift PG348Q (3440x1440 @100hz) CrossOver 27Q Led-P Logitech G15 EVGA SuperNova 1600T2 (Titanium) 
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Quad Damage
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 4930k @ 4.6Ghz Asus Rampage IV Extreme (Koolance Full WB) 2 x GTX 1080ti FE in SLI (EK WATERBLOCK) Corsair Dominator GT 2133 MHz (16GB) 
Hard DriveHard DriveHard DriveHard Drive
3 TB Seagate OCZ Vertex 4 256GB Crucial M4 128GB ADATA SX900 128GB 
CoolingCoolingCoolingCooling
RIVE Koolance Waterblock (VRM and PCH) Feser X-Changer 360 Feser X-Changer 240 Feser X-Changer 480 
CoolingCoolingCoolingOS
WaterCool MoRA3 Pro with Gentle Typhoon 3 x MCP 655 pumps (With EK top...all serial) 2 x EK FC 1080ti Blocks Windows 7 Ultimate x64 
MonitorMonitorKeyboardPower
Asus ROG Swift PG348Q (3440x1440 @100hz) CrossOver 27Q Led-P Logitech G15 EVGA SuperNova 1600T2 (Titanium) 
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Corsair Obsidian Heavily Modded Logitech G700 RocketFish Speed/Control M-audio AV-40 (Logitech G-35) 
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post #3 of 8
Not at all.
post #4 of 8
Thread Starter 
well then, the way I heard someone else talking it was like reducing my performance in half. That sheds some light on my situation. really appreciate it
Gaming Machine
(19 items)
 
  
CPUMotherboardGraphicsGraphics
FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
Mouse PadAudioOther
Rocketfish - Gaming Mouse Pad RAZER CARCHARIAS Bitfenix Recon 
  hide details  
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Gaming Machine
(19 items)
 
  
CPUMotherboardGraphicsGraphics
FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
Mouse PadAudioOther
Rocketfish - Gaming Mouse Pad RAZER CARCHARIAS Bitfenix Recon 
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post #5 of 8
Quote:
Originally Posted by Echosyp View Post

well then, the way I heard someone else talking it was like reducing my performance in half. That sheds some light on my situation. really appreciate it
Well, if you are going down to X4, it's going to make a dent in performance, otherwise it will be fine.
post #6 of 8
Thread Starter 
Quote:
Originally Posted by Art Vanelay View Post

Well, if you are going down to X4, it's going to make a dent in performance, otherwise it will be fine.

Read on my mobo specs and it supports quad SLI / Crossfire with 16x, 8x, 8x, 8x. So I figured putting my cards in slot 3 and 4 would be 8x 8x if I am correctly doing it right.
Gaming Machine
(19 items)
 
  
CPUMotherboardGraphicsGraphics
FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
Mouse PadAudioOther
Rocketfish - Gaming Mouse Pad RAZER CARCHARIAS Bitfenix Recon 
  hide details  
Reply
Gaming Machine
(19 items)
 
  
CPUMotherboardGraphicsGraphics
FX-8120 Asus Sabertooth 990FX XFX Double D 7850 XFX Double D 7850 
RAMHard DriveHard DriveHard Drive
PNY 1066 Mushkin SSD OCZ Vertex OCZ Vertex 
Optical DriveCoolingOSMonitor
LITE-ON DVD Burner Corsair H110 Windows 7 32" Insignia HDTV 
KeyboardPowerCaseMouse
Razer Black Widow Ultimate Corsair TX750 Cooler Master HAF X Logitech G500 
Mouse PadAudioOther
Rocketfish - Gaming Mouse Pad RAZER CARCHARIAS Bitfenix Recon 
  hide details  
Reply
post #7 of 8
PCI-E 3 is x16 and PCI-E 4 is x8.
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SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
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LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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HTPC
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AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
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LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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post #8 of 8
I lost about 300 points on 3Dmark11 by switching my GPU from PCI-E X16 slot 1 to PCI-E X16 slot 3, which was connected to my Southbridge, and the first one to my Northbridge
Ryzen
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AMD Ryzen 1700 Gigabyte AX370 Gaming K5 Nvidia GTX 770 G.Skill Trident Z 16GB 3000MHz 
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Ryzen
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AMD Ryzen 1700 Gigabyte AX370 Gaming K5 Nvidia GTX 770 G.Skill Trident Z 16GB 3000MHz 
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