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USB 3, SATA 3 and gpu performance

post #1 of 4
Thread Starter 
I have a gigabite h57 USB 3.0 motherboard.
The manual states that during USB 3 or SATA 3 function, the GPU bandwidth will switch from 16x to 8x.

Here is the question:

I have a single Nvidia card (a medium range GTS 450) and have an external USB 3 HD connected to the USB 3 port.

Does that mean that as long as it is connected to that port, the card will use 8x bandwidth, without any significant loss in performance (I read it is just 2-3 fps)? Or will that happen when say, I play a game and the system read from the hard drive? I have the vga card connected to the 16x pci slot.

In case of SLI will it have more impact in performance?
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Ubuntu 16.04 LTS 64-bit LG W2361V ASUS ROG Swift PG348Q Razer Blackwidow X Chroma 
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post #2 of 4
I believe that means the pcie will operate at 8x as long as the usb/sata 3 are on, whether in use or not. However, with a GTS450 or even in SLI you won't see much if any performance hit with the pci-e operating at 8x. I think in SLI that board would switch to 8x for both cards regardless of the USB/SATA3 operation.
enough cow bell
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enough cow bell
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post #3 of 4
Numerous tests have shown that going from x16 to x8 causes a very small loss of performance something in the range of 1-5% depending on several factors. Realistically you're not going to notice whether the card is running on x16 or x8.

If I understand you correctly the card should be on x16 most of the time unless that USB3 connection is being actively used, not just when it's plugged in.

In the case of SLI it's just a cummulative function so you'll lose 1-5% off each card which you'll notice even less than with just one. I assume you're asking hypothetically though since 450's can't be SLI'd.
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post #4 of 4
Thread Starter 
Thanks for the replies.

I was more worried whether the drive would use USB 3 speeds, but fortunately it does (Max 90 MB transfer rate, double than the USB 2 drive)
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CPUMotherboardGraphicsRAM
Intel 4790K  Gigabyte Z97-D3 MSI 1080 Gaming X Corsair DDR3 1600 MHz 12 GB 
Hard DriveOptical DriveCoolingOS
WD 1 TB LG BD-RE BH10LS30 Coolermaster Hyper 212+ Windows 10 Pro 64-bit 
OSMonitorMonitorKeyboard
Ubuntu 16.04 LTS 64-bit LG W2361V ASUS ROG Swift PG348Q Razer Blackwidow X Chroma 
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Silverstone Element ST 65EF Aero Cool GT Advanced Logitech G502 Proteus Spectrum Ednet xxxpad ProGamer 
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Last rig
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel 4790K  Gigabyte Z97-D3 MSI 1080 Gaming X Corsair DDR3 1600 MHz 12 GB 
Hard DriveOptical DriveCoolingOS
WD 1 TB LG BD-RE BH10LS30 Coolermaster Hyper 212+ Windows 10 Pro 64-bit 
OSMonitorMonitorKeyboard
Ubuntu 16.04 LTS 64-bit LG W2361V ASUS ROG Swift PG348Q Razer Blackwidow X Chroma 
PowerCaseMouseMouse Pad
Silverstone Element ST 65EF Aero Cool GT Advanced Logitech G502 Proteus Spectrum Ednet xxxpad ProGamer 
Audio
Realtek AC888 
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