Gigabyte P67 SATA performance bug?
Posted: Sat Sep 01, 2012 10:08 pm
Found an odd one that is fully repeatable, wondering if anyone else has a similar board that can test this as well.
Board: Gigabyte GA-P67A-UD4-B3 (try with any of the GA-P67A-UD* boards, I am curious if this is just this version or mine specifically)
SSD: Samsung 830 512GB (you need a newer SSD to test this as it looks like the bottleneck is in the ~260MB/s write range)
Ran the tests with both the F6 BIOS revision then upgraded to F8 (latest) revision, exact same results.
With BIOS set to defaults (c3/c6 enabled) run CDM/AS SSD. Take note of the write speed.
In BIOS disable c3/c6 under MIT-> (second option down, dont remember what its called) -> Advanced CPU settings -> C3/C6 (near the bottom) and run benchmarks again.
My results (c3/c6 enabled): ~260MB/s seq write
C3/C6 disabled: ~400MB/s seq write
Other tests showed similar speed increases.
Caught this by running benchmarks on a fresh install with only basic drivers installed (didnt install video driver yet, ran after video driver also, same results) and thought 260MB/s was way too slow for this drive. Checked drivers, cabling and other obvious things with no luck. Found a random post somewhere else on a different model board saying to try disabling c3/c6 so figured what the hell, wouldnt hurt and was surprised. Checked with Dan and it surprised him as he hasnt noticed it on any of the boards he has reviewed (he reviewed this board long ago, but it was a much older/slower ssd so the issue probably would not have come up).
Anyone have any thoughts (besides leave c3/c6 disabled)? Anyone else have a close enough board (or any other board really) that can reproduce this?
Board: Gigabyte GA-P67A-UD4-B3 (try with any of the GA-P67A-UD* boards, I am curious if this is just this version or mine specifically)
SSD: Samsung 830 512GB (you need a newer SSD to test this as it looks like the bottleneck is in the ~260MB/s write range)
Ran the tests with both the F6 BIOS revision then upgraded to F8 (latest) revision, exact same results.
With BIOS set to defaults (c3/c6 enabled) run CDM/AS SSD. Take note of the write speed.
In BIOS disable c3/c6 under MIT-> (second option down, dont remember what its called) -> Advanced CPU settings -> C3/C6 (near the bottom) and run benchmarks again.
My results (c3/c6 enabled): ~260MB/s seq write
C3/C6 disabled: ~400MB/s seq write
Other tests showed similar speed increases.
Caught this by running benchmarks on a fresh install with only basic drivers installed (didnt install video driver yet, ran after video driver also, same results) and thought 260MB/s was way too slow for this drive. Checked drivers, cabling and other obvious things with no luck. Found a random post somewhere else on a different model board saying to try disabling c3/c6 so figured what the hell, wouldnt hurt and was surprised. Checked with Dan and it surprised him as he hasnt noticed it on any of the boards he has reviewed (he reviewed this board long ago, but it was a much older/slower ssd so the issue probably would not have come up).
Anyone have any thoughts (besides leave c3/c6 disabled)? Anyone else have a close enough board (or any other board really) that can reproduce this?