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***The Official Core i5 Overclocking Thread***
- Thread starter easyrider
- Start date
was playing crysis wars on this pc and after 4 hours of continous play the game minimised with message saying system is running low on memory, check task manager and saw that crysis wars was hogging all the ram. no other apps running at the time either.
never had that issue before on my q9650 machine which is running 8gigs. (actually i did get that message once but thats when i ran linx on it and manually set the ram amount to use too high).
never had that issue before on my q9650 machine which is running 8gigs. (actually i did get that message once but thats when i ran linx on it and manually set the ram amount to use too high).
game has 64 bit executable too,
on topic again, iv been doing more stress tests but this time with full turbo mode enabled. when 1 or 2 cores are loaded it now clocks up to 4ghz, and all 4 cores loaded goes to 3.5ghz, 167x21 (x24 turbo), cpu volts had to be put to 1.35v for stability in this. tested using linx set to 1 thread only and then 2 thread mode.
i got a feeling my setup doesnt like high baseclock since i should be able to do 4ghz at 1.350v but im getting errors in linx after a day of running. i rekon its the memory controller, and i may need a LOT of vtt volts on this cpu to get the bclock up.
on topic again, iv been doing more stress tests but this time with full turbo mode enabled. when 1 or 2 cores are loaded it now clocks up to 4ghz, and all 4 cores loaded goes to 3.5ghz, 167x21 (x24 turbo), cpu volts had to be put to 1.35v for stability in this. tested using linx set to 1 thread only and then 2 thread mode.
i got a feeling my setup doesnt like high baseclock since i should be able to do 4ghz at 1.350v but im getting errors in linx after a day of running. i rekon its the memory controller, and i may need a LOT of vtt volts on this cpu to get the bclock up.
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Ok, I have to admit today - my Core i5 750 doesn't do 4GHz. No matter how hard I try, how many BIOSes and settings I use, I fail. I can play games for an hour or so, do some light tasks and benching - it won't be prime stable though. It does actually crash very quickly, after a few minutes. I tried multiple combinations of multpliers and base clocks. I did different settings for memory but the latter appeared to work even overclocked. I don't know what else I can do, it's either the mobo which gives me a massive overshoot in voltages or the CPU itself.
Last settings I tried:
CPU Multi - 20x
Base clock - 200
RAM - 1600MHz/CL8
QPI - 16x
Vcore - 1.3V (1.32V idle, 1.37V load)
VTT - 1.35V
DRAM - 1.65V
PLL - 1.9V
PCH - 1.1V
PCI-E clock - 102
C-states and C1E disabled
LLC on (when off I experience a vdroop of 0.05-0.07V)
RAM set to its timings (works well with lower multi for CPU).
I haven't played with other settings too much, maybe I'm missing out on something that might help.
IBT is useless for stress testing as it doesn't crash as often/quickly as prime95.
I can do 3.6GHz easily (21x171.5) with 1.225V under load (with power savings turned off to use lower voltages; otherwise unstable). This is rock solid so far. I really want more but I don't see any way to achieve 4GHz. Anyone willing to help?
PS forgot to add. If this piece of **** doesn't overclock further, I'm gonna sell it over and get an AMD platform for revenge.
Last settings I tried:
CPU Multi - 20x
Base clock - 200
RAM - 1600MHz/CL8
QPI - 16x
Vcore - 1.3V (1.32V idle, 1.37V load)
VTT - 1.35V
DRAM - 1.65V
PLL - 1.9V
PCH - 1.1V
PCI-E clock - 102
C-states and C1E disabled
LLC on (when off I experience a vdroop of 0.05-0.07V)
RAM set to its timings (works well with lower multi for CPU).
I haven't played with other settings too much, maybe I'm missing out on something that might help.
IBT is useless for stress testing as it doesn't crash as often/quickly as prime95.
I can do 3.6GHz easily (21x171.5) with 1.225V under load (with power savings turned off to use lower voltages; otherwise unstable). This is rock solid so far. I really want more but I don't see any way to achieve 4GHz. Anyone willing to help?
PS forgot to add. If this piece of **** doesn't overclock further, I'm gonna sell it over and get an AMD platform for revenge.
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you are aware that your gonna need a 5ghz amd to match a 4ghz intel these days right??
anyways if prime is crashing for you faster than linpak is then the issue is most likley with the VTT voltage or memory instability.
as shown above prime runs 72 hours straight for me but linpak fails in just over 1 hour.
from what iv noticed with these i5 cpu's, once you get the base clock up all sorts of factors start to effect stability.
so far im sticking with 167 x 21 to get 3.5ghz on 4 cores and turbo boots it up to 4ghz with 167 x 24 on 1 or 2 cores.
for that i need 1.35v core stock 1.1v vtt and stock 1.5v ram. ram is on 8x multi giving 1336mhz. 9-9-9-20something.
maybe you could try those settings too and see if your cpu manages 4ghz on turbo mode for 2 or less threads. could help narrow something down for you.
Ok, I will try it tomorrow but most likely I have tried it in the past and it did not work well (or so I remember). My current settings are as follows:
Vcore - 1.175V bios (1.2V idle, 1.225V load)
VTT - 1.15V
PLL - auto/1.8V
PCH - 1.065V
PCI-E clock - 102
So I would have to knock back bclk to 167 and turn on Turbo Boost along with C-states, right? Plus add a little juice (voltage) to the CPU.
Vcore - 1.175V bios (1.2V idle, 1.225V load)
VTT - 1.15V
PLL - auto/1.8V
PCH - 1.065V
PCI-E clock - 102
So I would have to knock back bclk to 167 and turn on Turbo Boost along with C-states, right? Plus add a little juice (voltage) to the CPU.
correct, then your setup shoudl look like this when 1 or 2 cores is put under load:
thanks to the c-states being enabled, on idle the temps drop to 26c due to the cores being shut down.
correct, then your setup shoudl look like this when 1 or 2 cores is put under load:
thanks to the c-states being enabled, on idle the temps drop to 26c due to the cores being shut down.
Can you tell me some details of your setup?
What mobo and memory you're using?
What vcore do you offset in BIOS and what it comes up to in idle/load/full load in Windows?
i5 750
gigabyte p55m-ud4
2 x 2gb corsair value ram 1333mhz 9-9-9-20 summink
300gb velociraptor
antec p180 mini
zalman 10x flex cooler with 1200rpm scythe sflex fan
8800gt 512mb with accelero s1 and 12cm sflex fan strapped on.
pioneer dvd 218
corsair 520w
bios settings, 1.350 v core
167 x 21 with turbo = 24
eist on, c states on, c1e on all power saving crap on.
vtt volts set to normal, all other volts such as pll, ram etc set to normal
ram volts set to normal 1.5v but board seems to overvolt to 1.55v
ram running at 1336mhz 167 x 8 9-9-9-20 something
oh forgot to say, load line calibration is turned off.
gigabyte p55m-ud4
2 x 2gb corsair value ram 1333mhz 9-9-9-20 summink
300gb velociraptor
antec p180 mini
zalman 10x flex cooler with 1200rpm scythe sflex fan
8800gt 512mb with accelero s1 and 12cm sflex fan strapped on.
pioneer dvd 218
corsair 520w
bios settings, 1.350 v core
167 x 21 with turbo = 24
eist on, c states on, c1e on all power saving crap on.
vtt volts set to normal, all other volts such as pll, ram etc set to normal
ram volts set to normal 1.5v but board seems to overvolt to 1.55v
ram running at 1336mhz 167 x 8 9-9-9-20 something
oh forgot to say, load line calibration is turned off.
Hi Cyber,
Got my rig stable under prim95 (over 4h), IBT (25 max both for 1 and 4 cores), some benches (Cinebench) and gaming (about 2-3h). It's all good, I wanna try to either lower the volts or get some more juice. It does fail in multithreaded benches, I don't achieve as many points as with 4 [email protected]. Plus the latter uses really low volts (but power savings are off). I'll try 171.5MHz bclk to get 3.6GHz on 4 cores and 4.1GHz on one/two cores. It should give me some boost in multithreaded apps.
Bclk 167.5MHz (gotta love how my board adds 0.5MHz to it...)
Vcore 1.35V idle/1.32V load/1.28V full load (high vdroop but as far as it's stable - I don't complain)
LLC off
VTT 1.18V (just to be on the safe side)
PLL 1.85V
PCH 1.08V
PCI-E 102 (I dunno, seems to help stability?)
C-states/C1E/EIST/Turbo on
Anything else as in previous post.
Got my rig stable under prim95 (over 4h), IBT (25 max both for 1 and 4 cores), some benches (Cinebench) and gaming (about 2-3h). It's all good, I wanna try to either lower the volts or get some more juice. It does fail in multithreaded benches, I don't achieve as many points as with 4 [email protected]. Plus the latter uses really low volts (but power savings are off). I'll try 171.5MHz bclk to get 3.6GHz on 4 cores and 4.1GHz on one/two cores. It should give me some boost in multithreaded apps.
Bclk 167.5MHz (gotta love how my board adds 0.5MHz to it...)
Vcore 1.35V idle/1.32V load/1.28V full load (high vdroop but as far as it's stable - I don't complain)
LLC off
VTT 1.18V (just to be on the safe side)
PLL 1.85V
PCH 1.08V
PCI-E 102 (I dunno, seems to help stability?)
C-states/C1E/EIST/Turbo on
Anything else as in previous post.
you can put vtt volts back to stock 1.10v, with only 167mhz base clock you wont need to increase the vtt voltage unless your running 4 sticks or ram (possibly then you can still run stock vtt, will confirm when i get 4 more gigs of ram)
if clocking up higher use around 5mhz baseclock jumps, e.g go to 170, 175 etc. going to 170 or more baseclock will most definatley need more vtt voltage added over stock.
i like the 4ghz single/dual core speeds, works well in most games i have. get the best of both worlds then.
im running 1.35v core, since 1.325v failed in linx. im sure i could work to something in the middle like 1.33xxx or 1.34xxx but wont bother yet unless i feel like doing more testing later on.
all 4 cores running 3.5ghz it does it on stock voltage, i think the vid of this cpu is 1.2650v. but the turbo boost to 4ghz is needing big bump in volts. probably a duff clocker i got but anything over stock speed is bonus.
if clocking up higher use around 5mhz baseclock jumps, e.g go to 170, 175 etc. going to 170 or more baseclock will most definatley need more vtt voltage added over stock.
i like the 4ghz single/dual core speeds, works well in most games i have. get the best of both worlds then.
im running 1.35v core, since 1.325v failed in linx. im sure i could work to something in the middle like 1.33xxx or 1.34xxx but wont bother yet unless i feel like doing more testing later on.
all 4 cores running 3.5ghz it does it on stock voltage, i think the vid of this cpu is 1.2650v. but the turbo boost to 4ghz is needing big bump in volts. probably a duff clocker i got but anything over stock speed is bonus.
you got me back in the testing game now, im trying lower voltages too on the core.
running linx single thread now, i testing the voltage 1 notch above 1.3250v i think it was 1.33xxv
idle in windows cpuz shows 1.312v single core load went to 1.296v will test dual and 4 thread load in few mins, need to go toilet for a dump.
running linx single thread now, i testing the voltage 1 notch above 1.3250v i think it was 1.33xxv
idle in windows cpuz shows 1.312v single core load went to 1.296v will test dual and 4 thread load in few mins, need to go toilet for a dump.
just checked, with 2 3 and 4 threads in linx the cpu volts dont drop below 1.280v, thats with the vcore set to 1 notch above 1.32500v, which i think is 1.33xxxx i will confirm the actual figure for you when i next restart the pc.
linx ran for 1 hour with no errors on 1.33xxx volts so i guess i could deffo be stable well below 1.3500v will run linx overnight now to get proper results.
linx ran for 1 hour with no errors on 1.33xxx volts so i guess i could deffo be stable well below 1.3500v will run linx overnight now to get proper results.
no good, 1.33750v is unstable:
not gonna bother testing 1.34xx v just gonna leave it at 1.3500v. im wondering now about my stability issues with running 3.8 ghz on all 4 cores before, maybe i need to try 1.40v at 3.8ghz with this cpu.
either way from what iv seen linpak needs to be run for a good 24+ hours on a 4 gig ram system to get a good idea on system stability.
not gonna bother testing 1.34xx v just gonna leave it at 1.3500v. im wondering now about my stability issues with running 3.8 ghz on all 4 cores before, maybe i need to try 1.40v at 3.8ghz with this cpu.
either way from what iv seen linpak needs to be run for a good 24+ hours on a 4 gig ram system to get a good idea on system stability.
Linpack was usually stable for me wherever prime95 blend wasn't. I'll do linpack tomorrow, any recommended settings?
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