Intel Burn Test 2500k VS 2600K

Sin_Chase · 9 Nov 2011 at 15:55

2500k @ 4.5Ghz - 122Gflops w/ 6GB Memory

2600k @ 4.5Ghz HT On - 103Gflops w/ 6GB Memory

Kweh :confused:

Been messing with voltages and everything and cannot get my 2600k above 106Gflops.

Am I missing something? Identical versions of IBT, Identical Windows 7 SP1 installs. Both on Asus P8P67 boards with pretty much identical configurations.

I am stable, and it's plenty fast enough but it bothers me that Gflops wise I seem under par.

Halp!

minimadmotorman · 9 Nov 2011 at 15:57

Tried turning HT off?

Sin_Chase · 9 Nov 2011 at 16:02

Just tried with HT Off - 124Gflops.

Why does HT nuke the Gflops on IBT? I'm not really concerned - numbers are numbers, just curious really.

minimadmotorman · 9 Nov 2011 at 16:09

Not sure just seen it happen before. I wouldn't worry about it too much. Perhaps its something to do with IBT?

pgi947 · 9 Nov 2011 at 18:05

did you set the IBT 'threads' to auto or 4 and 8 respectively?

The highest I recall seeing on my 2600k was about 118g/flops

weird_dave · 9 Nov 2011 at 18:52

HT doesn't work with IBT, HT uses un-used parts of the CPU. Since all the threads want the same CPU resources, it ends up being slower because of all the context switching.

Sin_Chase · 9 Nov 2011 at 19:05

pgi947 said:
did you set the IBT 'threads' to auto or 4 and 8 respectively?

The highest I recall seeing on my 2600k was about 118g/flops

Manually set to 8.

HT off with Auto netted 124Gflops.

weird_dave said:
HT doesn't work with IBT, HT uses un-used parts of the CPU. Since all the threads want the same CPU resources, it ends up being slower because of all the context switching.

Cheers for that.