- Jan 20, 2013
- 153
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Title pretty much says it all: Is the PCI latency timer setting in the BIOS relevant if I only have one PCI device? I've got one PCIe3 video card (Radeon HD 7950) hooked up; no discrete audio or anything else like that. Super simple.
I've noticed a substantial amount of lag in places when playing bioshock infinite, which really just shouldn't be the case. This couldn't be the culprit, though, could it?
My presumption is that if there's only one PCI device, then it shouldn't make a difference, but I don't know if perhaps every 32 clock cycles, for example (if that's the setting of the latency timer), some kind of check is performed to see if any of the other slots have any data to send, and I'm losing PCI bandwidth on empty checks... I'd love for someone to share their expertise with me
My motherboard is an MSI Z77A-G45:
http://www.msi.com/product/mb/Z77A-G45.html
2 x PCIe 3.0 x16 slots
1 x PCIe 2.0 x16 slot (only supports up to x4 speed)
4 x PCIe 2.0 x1 slots
I've noticed a substantial amount of lag in places when playing bioshock infinite, which really just shouldn't be the case. This couldn't be the culprit, though, could it?
My presumption is that if there's only one PCI device, then it shouldn't make a difference, but I don't know if perhaps every 32 clock cycles, for example (if that's the setting of the latency timer), some kind of check is performed to see if any of the other slots have any data to send, and I'm losing PCI bandwidth on empty checks... I'd love for someone to share their expertise with me
My motherboard is an MSI Z77A-G45:
http://www.msi.com/product/mb/Z77A-G45.html
2 x PCIe 3.0 x16 slots
1 x PCIe 2.0 x16 slot (only supports up to x4 speed)
4 x PCIe 2.0 x1 slots
According to this, you get better bandwidth with a higher value for your one PCI device. I'm sure you've tried already and noticed whether or not your experience was affected.
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