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Here are some 3DMark 2006 results with Hyper Threading on and off on different OSes.
--------------Windows XP-Windows Vista-Windows 7 (All x64)
[4GHz HT off]
SM 2.0 -------|8789|------|8939|--------|8950|
SM 3.0 -------|9328|------|9468|--------|9460|
CPU ----------|7030|------|6113|--------|6238|
[4GHz HT on]
SM 2.0 -------|8764|------|8492|--------|8959|
SM 3.0 -------|8857|------|9446|--------|9469|
CPU ----------|7549|------|6725|--------|6628|
[4.2GHz HT off]
SM 2.0 -------|8883|------|9054|--------|9056|
SM 3.0 -------|9400|------|9515|--------|9516|
CPU ----------|7373|------|6378|--------|6465|
Summary:
Windows XP has the best CPU score, SM 3.0 point decrease with HT on (9328->8857)
Windows Vista SM 2.0 point decrease with HT on (8939->8492)
There is no different on Windows 7 except CPU score, and it has the best SM 2.0 and 3.0 points.
XP has the best overall score because the CPU score is alot higher than others.
There is lil different on Windows 7 when OC the CPU to 4.2GHz, this could be GPU limited not CPU. If this is true, with a faster GPU, it's quite possible that with HT on and Windows 7, the score will come out on top (proving HT on + Windows 7 = best performance).
Screenshots:
Windows XP
Windows Vista
Windows 7
--------------Windows XP-Windows Vista-Windows 7 (All x64)
[4GHz HT off]
SM 2.0 -------|8789|------|8939|--------|8950|
SM 3.0 -------|9328|------|9468|--------|9460|
CPU ----------|7030|------|6113|--------|6238|
[4GHz HT on]
SM 2.0 -------|8764|------|8492|--------|8959|
SM 3.0 -------|8857|------|9446|--------|9469|
CPU ----------|7549|------|6725|--------|6628|
[4.2GHz HT off]
SM 2.0 -------|8883|------|9054|--------|9056|
SM 3.0 -------|9400|------|9515|--------|9516|
CPU ----------|7373|------|6378|--------|6465|
Summary:
Windows XP has the best CPU score, SM 3.0 point decrease with HT on (9328->8857)
Windows Vista SM 2.0 point decrease with HT on (8939->8492)
There is no different on Windows 7 except CPU score, and it has the best SM 2.0 and 3.0 points.
XP has the best overall score because the CPU score is alot higher than others.
There is lil different on Windows 7 when OC the CPU to 4.2GHz, this could be GPU limited not CPU. If this is true, with a faster GPU, it's quite possible that with HT on and Windows 7, the score will come out on top (proving HT on + Windows 7 = best performance).
Screenshots:
Windows XP



Windows Vista



Windows 7


