- Nov 4, 1999
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I finally got the adapter brackets for my ancient TR Ultima90 to go onto to my 3600 the other day .
With the reduced CPU PPT of 65w I had set for the stock cooler, temp's reduced by ~15C with LHC and Rosetta! (vs the stock Stealth POS cooler, same ambient temp's).
Anyway, now that I've got the thermal headroom I've put the PPT back to stock (auto, max 88w), and power consumption at the wall has gone up to ~158w from ~129w running Rosetta (same WUs, approx 3.725-3.75 GHz, VID ~1.14v to ~3.9 GHz, VID ~v1.3).
CPU temp ~60C with 65w PPT, 75-76C with 88w PPT. So that's a 22.5% power increase for a 4% clock speed increase! Err, that's not worth it! (3.75 to 3.9 GHz).
And to ~148w from ~130w running LHC (avx WUs) (~3.825 GHz ~1.2v VID, to 3.925 GHz, VID ~1.32v), CPU temp ~63C with 65w PPT, ~76C with 88w PPT. And here that's a 13.8% power increase for a 2.6% clock speed increase, not as bad, but still not worth it!
So I was wondering what you guys had found was the sweet spot between power setting/clock rate & power consumption/ppd?
Btw, anyone know why more power is used when running Rosetta vs LHC but lower vcore & clock speed at the default auto PPT setting?? [edit] I guess I'm hitting some other limit with Rosetta?
Auto PPT (max 88w. 11w over previous setting, +14.3%)(23w, +35.4% over 65w PPT setting)
LHC wall draw 148w, 3.925 GHz, VID ~1.32v, CPU 76C, +13.8% power usage for a 2.6% clock speed increase vs 65w PPT.
Rosetta wall draw 158w, 3.9 GHz, VID ~1.3v, CPU 75-76C, +22.5%(wth!?) power usage for a 4% clock speed increase vs 65w PPT.
HWiNFO PRD CinebenchR20 ~99%, score 3499 (+5% over 65w PPT setting).
Trying in between PPT limits....
77w PPT (5w over previous setting, +6.9%.)(12w, +18.5% over 65w PPT setting)
LHC wall draw 144w, 3.9-3.925 GHz, VID 1.3v, CPU temp 73C.
Extra 10.8% power usage for a 2% clock speed increase vs 65w PPT.
Rosetta wall draw 145w, 3.85 GHz, VID 1.23v, CPU temp 68C.
Extra 12.4% power usage for a 2.7% clock speed increase vs 65w PPT.
72w PPT (7w over previous setting, +10.8%)
LHC wall draw 137w, 3.875 GHz, VID ~1.26v, CPU temp 69C.
Extra 5.4% power usage for a 1.3% clock speed increase vs 65w PPT.
Rosetta wall draw 138w, 3.8-3.825 GHz, VID ~1.2v, CPU temp 65C.
Extra 7% power usage, also for a 1.3% clock speed increase (3.75 vs 3.825 GHz) vs 65w PPT.
65w PPT (12w over previous setting, +23%)
LHC wall draw 130w, 3.825 GHz, VID ~1.2v, CPU 63C.
Extra 13% power usage for a 4.1% clock speed increase vs 53w PPT.
Rosetta wall draw 129w, 3.725-3.75 GHz, VID ~1.14v, CPU 60C.
Extra 12.2% power usage for a 4.2%+ clock speed increase vs 53w PPT.
CinebenchR20 score 3327
53w PPT
LHC wall draw 115w, 3.675 GHz, VID ~1.1v, CPU 55C
Rosetta wall draw 115w, 3.575 GHz, VID ~1.03v, CPU 52C
Ambient 22C throughout. PSU is a 2009 Corsair TX650 with a basic 80+ eff rating (replacing soon). Mains 230v. All fan speeds fixed except the PSU.
Wall draw figures are a visual average over about 1/2 a minute. Clock speed, VID & CPU temps from HWiNFO64 v6.27.4185 beta. Win 10 64bit...... think that covers it!
In the end I stuck with the 65w PPT setting as it gave me much lower temps (13-16C!), cut power consumption by 12-18%, with only a 2.6-3.8% cut in all core loaded clock speed (all for LHC & R@H) vs Auto/88w PPT. The only benchmark I did was with CinebenchR20 (default settings), this showed just a small loss of performance of 4.9%.
With the reduced CPU PPT of 65w I had set for the stock cooler, temp's reduced by ~15C with LHC and Rosetta! (vs the stock Stealth POS cooler, same ambient temp's).
Anyway, now that I've got the thermal headroom I've put the PPT back to stock (auto, max 88w), and power consumption at the wall has gone up to ~158w from ~129w running Rosetta (same WUs, approx 3.725-3.75 GHz, VID ~1.14v to ~3.9 GHz, VID ~v1.3).
CPU temp ~60C with 65w PPT, 75-76C with 88w PPT. So that's a 22.5% power increase for a 4% clock speed increase! Err, that's not worth it! (3.75 to 3.9 GHz).
And to ~148w from ~130w running LHC (avx WUs) (~3.825 GHz ~1.2v VID, to 3.925 GHz, VID ~1.32v), CPU temp ~63C with 65w PPT, ~76C with 88w PPT. And here that's a 13.8% power increase for a 2.6% clock speed increase, not as bad, but still not worth it!
So I was wondering what you guys had found was the sweet spot between power setting/clock rate & power consumption/ppd?
Btw, anyone know why more power is used when running Rosetta vs LHC but lower vcore & clock speed at the default auto PPT setting?? [edit] I guess I'm hitting some other limit with Rosetta?
Auto PPT (max 88w. 11w over previous setting, +14.3%)(23w, +35.4% over 65w PPT setting)
LHC wall draw 148w, 3.925 GHz, VID ~1.32v, CPU 76C, +13.8% power usage for a 2.6% clock speed increase vs 65w PPT.
Rosetta wall draw 158w, 3.9 GHz, VID ~1.3v, CPU 75-76C, +22.5%(wth!?) power usage for a 4% clock speed increase vs 65w PPT.
HWiNFO PRD CinebenchR20 ~99%, score 3499 (+5% over 65w PPT setting).
Trying in between PPT limits....
77w PPT (5w over previous setting, +6.9%.)(12w, +18.5% over 65w PPT setting)
LHC wall draw 144w, 3.9-3.925 GHz, VID 1.3v, CPU temp 73C.
Extra 10.8% power usage for a 2% clock speed increase vs 65w PPT.
Rosetta wall draw 145w, 3.85 GHz, VID 1.23v, CPU temp 68C.
Extra 12.4% power usage for a 2.7% clock speed increase vs 65w PPT.
72w PPT (7w over previous setting, +10.8%)
LHC wall draw 137w, 3.875 GHz, VID ~1.26v, CPU temp 69C.
Extra 5.4% power usage for a 1.3% clock speed increase vs 65w PPT.
Rosetta wall draw 138w, 3.8-3.825 GHz, VID ~1.2v, CPU temp 65C.
Extra 7% power usage, also for a 1.3% clock speed increase (3.75 vs 3.825 GHz) vs 65w PPT.
65w PPT (12w over previous setting, +23%)
LHC wall draw 130w, 3.825 GHz, VID ~1.2v, CPU 63C.
Extra 13% power usage for a 4.1% clock speed increase vs 53w PPT.
Rosetta wall draw 129w, 3.725-3.75 GHz, VID ~1.14v, CPU 60C.
Extra 12.2% power usage for a 4.2%+ clock speed increase vs 53w PPT.
CinebenchR20 score 3327
53w PPT
LHC wall draw 115w, 3.675 GHz, VID ~1.1v, CPU 55C
Rosetta wall draw 115w, 3.575 GHz, VID ~1.03v, CPU 52C
Ambient 22C throughout. PSU is a 2009 Corsair TX650 with a basic 80+ eff rating (replacing soon). Mains 230v. All fan speeds fixed except the PSU.
Wall draw figures are a visual average over about 1/2 a minute. Clock speed, VID & CPU temps from HWiNFO64 v6.27.4185 beta. Win 10 64bit...... think that covers it!
In the end I stuck with the 65w PPT setting as it gave me much lower temps (13-16C!), cut power consumption by 12-18%, with only a 2.6-3.8% cut in all core loaded clock speed (all for LHC & R@H) vs Auto/88w PPT. The only benchmark I did was with CinebenchR20 (default settings), this showed just a small loss of performance of 4.9%.
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