Overclock.net › Forums › Industry News › Hardware News › [Youtube] PCIe 16x vs 8x vs 4x With HD 6990
New Posts  All Forums:Forum Nav:

[Youtube] PCIe 16x vs 8x vs 4x With HD 6990

post #1 of 34
Thread Starter 

Quote:
As requested I've re-run some of the tests using a Radeon HD 6990 in an x16, x8, and x4 slot to find out how the bandwidth affects performance.
It seems even x4 does not make that much of a difference even in high end GPUs. Going from 16x to 4x is about a ~2% decrease in performance. (Essentially two Xfired 6970 running in 2x 2x).
Old Reliable
(15 items)
 
  
CPUMotherboardGraphicsRAM
955BE C3 @ 3.82 GHz [1.404v Load] ASUS M4A88T-V EVO/USB3 [2.8 GHz NB @ 1.318v] ASUS ROG STRIX RX 470 2x4GB G.SKILL Ripjaws [1600 8-8-8-24 @ 1.5v] 
Hard DriveOptical DriveCoolingOS
320GB WD Caviar Blue Sony Optiarc DVD RW AD-7260S ATA XSPC Rasa 750 RS240 [Backplate Mod] [MX-2] Windows 7 Ultimate 64-Bit 
MonitorKeyboardPowerCase
Acer H236HLbid  Logitech K120 OCZ ModXStream Pro 600W Modular NZXT M59 [5 x 120mm Fans + Rheobus Fan Controller] 
MouseAudioAudio
Logitech MX518 ASUS Xonar DG + Logitech Z523 Turtle Beach Ear Force X11s 
  hide details  
Reply
Old Reliable
(15 items)
 
  
CPUMotherboardGraphicsRAM
955BE C3 @ 3.82 GHz [1.404v Load] ASUS M4A88T-V EVO/USB3 [2.8 GHz NB @ 1.318v] ASUS ROG STRIX RX 470 2x4GB G.SKILL Ripjaws [1600 8-8-8-24 @ 1.5v] 
Hard DriveOptical DriveCoolingOS
320GB WD Caviar Blue Sony Optiarc DVD RW AD-7260S ATA XSPC Rasa 750 RS240 [Backplate Mod] [MX-2] Windows 7 Ultimate 64-Bit 
MonitorKeyboardPowerCase
Acer H236HLbid  Logitech K120 OCZ ModXStream Pro 600W Modular NZXT M59 [5 x 120mm Fans + Rheobus Fan Controller] 
MouseAudioAudio
Logitech MX518 ASUS Xonar DG + Logitech Z523 Turtle Beach Ear Force X11s 
  hide details  
Reply
post #2 of 34
3d mark is more compute intensive which tends to not show any difference in bandwidth. Real gaming, especially on games with large textures and a lot of pixel mapping the effect is more noticeable. I would expect even in 4x mode a performance delta of no more then 25%, meaning anyone using a x8 slot need not worry about it.

Multi GPU performance is a little bit more bandwidth bound. Crossfire 6990 would benefit from 2 x16 probably more then one 6990 would benefit over a x4.
post #3 of 34
Are you even able to legitamately state "essentially two Xfired 6970s running in 2x 2x."?
post #4 of 34
3DMark is fail, use actual games.
    
CPUMotherboardGraphicsRAM
Intel Core i5 3570k @ 4.5Ghz ASRock Z77 Pro3 Powercolor Radeon HD7950 3GB @ 1150/1350 4x4GB G.Skill Ares 2000Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 250GB Western Digital Black 1TB WD1002FAEX Seagate Barracuda 3TB ST3000DM001 Samsung Spinpoint EcoGreen 2TB 
Optical DriveCoolingCoolingCooling
Pioneer DVR-220LBKS Noctua NH-D14 Scythe Gentle Typhoon 1850rpm Corsair AF140 Quiet Edition 
CoolingOSMonitorMonitor
Arcitc Cooling Acclero Twin Turbo II Arch Linux x86-64, amdgpu BenQ G2220HD BenQ G2020HD 
KeyboardPowerCaseMouse
Ducky Shine III Year of the Snake, Cherry Blue Silverstone Strider Plus 600w CoolerMaster CM690 II Black and White SteelSeries Sensei Professional 
Mouse PadAudioOther
Artisan Hien Mid Japan Black Large ASUS Xonar DX NZXT Sentry Mesh 30w Fan Controller 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel Core i5 3570k @ 4.5Ghz ASRock Z77 Pro3 Powercolor Radeon HD7950 3GB @ 1150/1350 4x4GB G.Skill Ares 2000Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 250GB Western Digital Black 1TB WD1002FAEX Seagate Barracuda 3TB ST3000DM001 Samsung Spinpoint EcoGreen 2TB 
Optical DriveCoolingCoolingCooling
Pioneer DVR-220LBKS Noctua NH-D14 Scythe Gentle Typhoon 1850rpm Corsair AF140 Quiet Edition 
CoolingOSMonitorMonitor
Arcitc Cooling Acclero Twin Turbo II Arch Linux x86-64, amdgpu BenQ G2220HD BenQ G2020HD 
KeyboardPowerCaseMouse
Ducky Shine III Year of the Snake, Cherry Blue Silverstone Strider Plus 600w CoolerMaster CM690 II Black and White SteelSeries Sensei Professional 
Mouse PadAudioOther
Artisan Hien Mid Japan Black Large ASUS Xonar DX NZXT Sentry Mesh 30w Fan Controller 
  hide details  
Reply
post #5 of 34
He should test these in games.
post #6 of 34
this reminds me of that episode of Top Gear where the Avantime ran slower with better tires, brakes and suspension......baffling.....can we try a different bencher?
    
CPUMotherboardGraphicsRAM
X5680@4.8GHz 192x25x1.47v EVGA X58 Classified(E759) EVGA GTX980 Ti SLI @1515/8400 6x4GB GSkill Ripjaws@1540 8-8-8-20-2T-1.55v 
Hard DriveHard DriveHard DriveCooling
Corsair Force GT 120GB/OS Corsair Force LS 60GB/PAGE Toshiba 4TB/GAMES CPU-EK Supremacy 
CoolingCoolingCoolingCooling
MB-EK FB Classified GPU-EK FC TitanX/Backplates Rad-Swiftech 360mm MCR-320/Pump Rad-Barrow 280mm 
CoolingCoolingCoolingOS
Ram-Corsair 2x60mm Resevoir-Barrow 250x50mm Misc-6x120mm/2x140mm/NZXT Sentry,Barrow 3/8 fit... Windows 10 Pro x64 
MonitorKeyboardPowerCase
Seiki 50'' 3840x2160 30hz Logitech G110 EVGA Supernova G2 1300 Lian Li PC-A77F 
MouseMouse PadOtherOther
Logitech G9x Xtrac Ripper XL Logitech G27 Logitech G940 
Other
Xbox One controller 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X5680@4.8GHz 192x25x1.47v EVGA X58 Classified(E759) EVGA GTX980 Ti SLI @1515/8400 6x4GB GSkill Ripjaws@1540 8-8-8-20-2T-1.55v 
Hard DriveHard DriveHard DriveCooling
Corsair Force GT 120GB/OS Corsair Force LS 60GB/PAGE Toshiba 4TB/GAMES CPU-EK Supremacy 
CoolingCoolingCoolingCooling
MB-EK FB Classified GPU-EK FC TitanX/Backplates Rad-Swiftech 360mm MCR-320/Pump Rad-Barrow 280mm 
CoolingCoolingCoolingOS
Ram-Corsair 2x60mm Resevoir-Barrow 250x50mm Misc-6x120mm/2x140mm/NZXT Sentry,Barrow 3/8 fit... Windows 10 Pro x64 
MonitorKeyboardPowerCase
Seiki 50'' 3840x2160 30hz Logitech G110 EVGA Supernova G2 1300 Lian Li PC-A77F 
MouseMouse PadOtherOther
Logitech G9x Xtrac Ripper XL Logitech G27 Logitech G940 
Other
Xbox One controller 
  hide details  
Reply
post #7 of 34
I kinda want to try putting a 8800GTS in a x1 slot lol...
     
CPUMotherboardGraphicsRAM
FX 8320E AsRock 970M Pro3 Zotac GTX 1060 Mini 3GB 8GB KLEVV NEO 1600Mhz CL9 
Hard DriveCoolingOSMonitor
2 x SP S60 120GB RAID 0 Corsair H60 Windows 10 Qnix QX2710 @ 96Hz 
KeyboardPowerCaseMouse
Ducky Shine 2 Antec Neo ECO 520W Antec mini P180 Mionix Naos 7000 
Mouse Pad
Artisan Hien VE 
CPUMotherboardGraphicsRAM
Xeon X3430 Supermicro X8SIE-F XFX 9800 GT  8GB Hynix DDR3 1333MHz ECC R 
Hard DriveHard DriveCoolingOS
Crucial C300 64GB WD Black 750GB Intel stock yo Windows 7 Ultimate 
MonitorPowerCaseAudio
BenQ GL2760H EVGA Supernova G2 750W CM Centurion 590 Infinity Primus P150 
Audio
Lepai LP-2020A+ 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
FX 8320E AsRock 970M Pro3 Zotac GTX 1060 Mini 3GB 8GB KLEVV NEO 1600Mhz CL9 
Hard DriveCoolingOSMonitor
2 x SP S60 120GB RAID 0 Corsair H60 Windows 10 Qnix QX2710 @ 96Hz 
KeyboardPowerCaseMouse
Ducky Shine 2 Antec Neo ECO 520W Antec mini P180 Mionix Naos 7000 
Mouse Pad
Artisan Hien VE 
CPUMotherboardGraphicsRAM
Xeon X3430 Supermicro X8SIE-F XFX 9800 GT  8GB Hynix DDR3 1333MHz ECC R 
Hard DriveHard DriveCoolingOS
Crucial C300 64GB WD Black 750GB Intel stock yo Windows 7 Ultimate 
MonitorPowerCaseAudio
BenQ GL2760H EVGA Supernova G2 750W CM Centurion 590 Infinity Primus P150 
Audio
Lepai LP-2020A+ 
  hide details  
Reply
post #8 of 34
well my 570 is running at 8x right now (motherboard lacks 16x) so hopefully i'm not losing too much performance
Bender
(18 items)
 
  
CPUMotherboardGraphicsGraphics
Core i5-2500k @ 4.6Ghz Gigabyte Z68X-UD3H-B3 Sapphire AMD R9 290X Tri-X (1050/1300mhz)  EVGA GeForce GTX 1080 (How do you OC?) 
RAMHard DriveHard DriveOS
8GB 1600Mhz OCZ Vertex 3 240GB SSD OCZ Vertex 3 240GB SSD windows 10 64bit 
MonitorKeyboardPowerCase
Asus MG279Q Logitech G510  Corsair TX750 CM II 690 Advanced 
MouseMouse PadAudioAudio
CM Sentinel Advance  some big corsair one beyerdynamic DT 770 Pro 250 Ohm SoundBlaster Z Soundcard 
  hide details  
Reply
Bender
(18 items)
 
  
CPUMotherboardGraphicsGraphics
Core i5-2500k @ 4.6Ghz Gigabyte Z68X-UD3H-B3 Sapphire AMD R9 290X Tri-X (1050/1300mhz)  EVGA GeForce GTX 1080 (How do you OC?) 
RAMHard DriveHard DriveOS
8GB 1600Mhz OCZ Vertex 3 240GB SSD OCZ Vertex 3 240GB SSD windows 10 64bit 
MonitorKeyboardPowerCase
Asus MG279Q Logitech G510  Corsair TX750 CM II 690 Advanced 
MouseMouse PadAudioAudio
CM Sentinel Advance  some big corsair one beyerdynamic DT 770 Pro 250 Ohm SoundBlaster Z Soundcard 
  hide details  
Reply
post #9 of 34
for once I have to side with Linus' critics, he should have used games in these benchmarks, both with this test and the GTX 580s in the video made earlier today
post #10 of 34
funny how everyone complains and says that it will really affect it in games only but yet noone has done a video in games? i still dont think it will hinder the performance that much to make a difference
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
I5 2500K AsRock extreme4 p67 GTX 470 SLI 8gb Gskill 
Hard DriveOSMonitorKeyboard
Crucial 128gb,WD black 1tb, Seagate 500gb windows 7 64 bit Enterprise U2311H Razor 
PowerCaseAudioAudio
Antec HCP 1200 Corsair 800D xonar DX M-Audio BX5a 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
I5 2500K AsRock extreme4 p67 GTX 470 SLI 8gb Gskill 
Hard DriveOSMonitorKeyboard
Crucial 128gb,WD black 1tb, Seagate 500gb windows 7 64 bit Enterprise U2311H Razor 
PowerCaseAudioAudio
Antec HCP 1200 Corsair 800D xonar DX M-Audio BX5a 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Hardware News
Overclock.net › Forums › Industry News › Hardware News › [Youtube] PCIe 16x vs 8x vs 4x With HD 6990