Overclock.net › Forums › AMD › AMD CPUs › Phenom II 955 BE - almost stable at 4.2 GHz?
New Posts  All Forums:Forum Nav:

Phenom II 955 BE - almost stable at 4.2 GHz? - Page 4

post #31 of 54
Your FSB is 225 and multi is 18.5 (from the main post) so where are you getting the 255 from?

Anyway, once you have that sorted out, here is the thing.... 1.56v is tooo much for a phenom cpu. although it can handle that amount it would be a mistake to increase it even more.
Now, you are getting "rounding off" errors in a thread while testing small FFTs (in place perhaps). In this case data is stored and tested primarily in the L2 cache and fpu is tested. So, to pinpoint the actual source of the problem first lower memory speed to at least 1400MHz ( small FFT does test a small amount of ram, try blend and you will see a failure much sooner than 2 hrs) ), lower cpu/nb to 2500MHz ( you actually do not need more than that because of your low ram speed, cpu/nb voltage is fine). Now test again and keep on doing that(lowering ram speed) until you have a stable prime result. Also make sure that your ram has CR set to 2T. If this does not help then you HAVE TO lower your cpu speed. It is pretty amazing though that the way your mobo is supporting that OC at that outrageous voltage. If I had tried that with my 955, probably my house would have burnt down from heat.
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
post #32 of 54
Quote:
Originally Posted by pablo.santiago View Post
Can't check temp by core, I only get "CPU Temperature" (I know, Linux hasn't the best OC tools, but is very stable).

Last test is still running but I'm pretty sure it'll eventually fail. Should I keep raising VCore?
I definitely would not increase the voltage any more. Also I know that sometimes CPU temp can be lower than core temperature. I always go by core temperature, I'm not sure which one is more important. Maybe someone else can stop in and enlighten us on that point.

Quote:
the voltage I set and the one both BIOS and lm-sensors display is not the same. For example, when I set VCore to 1.525v, BIOS' hardware monitor said it's at 1.476v and lm-sensors 1.43v.
Any idea what could be causing different readings?
It could be Vdroop, or it could just be a funky reading in the program you're using to monitor voltage, or both. I don't really understand why Vdroop occurs, but it is basically a drop in voltage when your CPU is under load.

I've gotten my 955 Prime stable at 4.25GHz, 1.44v, so the 1.525 you're using should be more than adequate. I would definitely get your RAM down to 1333MHz (if that is the stock speed), maybe try dropping the NB to 2.5GHz with 1.2v? Maybe drop the HT link to somewhere between 1500-2000MHz just for the sake of trying it. Never hurts to rule things out, if possible.

edit: Are your RAM timings and voltage at their stock settings?
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
post #33 of 54
Thread Starter 
Quote:
Originally Posted by leopold1985 View Post
Your FSB is 225 and multi is 18.5 (from the main post) so where are you getting the 255 from?

Anyway, once you have that sorted out, here is the thing.... 1.56v is tooo much for a phenom cpu. although it can handle that amount it would be a mistake to increase it even more.
Now, you are getting "rounding off" errors in a thread while testing small FFTs (in place perhaps). In this case data is stored and tested primarily in the L2 cache and fpu is tested. So, to pinpoint the actual source of the problem first lower memory speed to at least 1400MHz ( small FFT does test a small amount of ram, try blend and you will see a failure much sooner than 2 hrs) ), lower cpu/nb to 2500MHz ( you actually do not need more than that because of your low ram speed, cpu/nb voltage is fine). Now test again and keep on doing that(lowering ram speed) until you have a stable prime result. Also make sure that your ram has CR set to 2T. If this does not help then you HAVE TO lower your cpu speed. It is pretty amazing though that the way your mobo is supporting that OC at that outrageous voltage. If I had tried that with my 955, probably my house would have burnt down from heat.
255 was a typo. The actual settings are 225 x 18.5.

And you were right. Doing any Blend testing results in a failure within 1-2 minutes.
I tried what you suggested, but it keeps failing. You can check the results here: https://spreadsheets.google.com/pub?...UE&output=html

EDIT: Last 5 tests had CR set to 2T.
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
post #34 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
I've gotten my 955 Prime stable at 4.25GHz, 1.44v, so the 1.525 you're using should be more than adequate. I would definitely get your RAM down to 1333MHz (if that is the stock speed), maybe try dropping the NB to 2.5GHz with 1.2v? Maybe drop the HT link to somewhere between 1500-2000MHz just for the sake of trying it. Never hurts to rule things out, if possible.
Yes, 1333 Mhz is the stock speed but with my current CPU settings that value is not an option in my BIOS. Only ones are: Auto; 900; 1200; 1500; 1800.
Please check the link I posted above. Tried NB @ 2475MHz with 1.2v. It still fails.

Dropping the HT Link to 1575 MHz made the system unable to POST.

Quote:
Originally Posted by falconkaji View Post
Are your RAM timings and voltage at their stock settings?
No, not exactly. According to their SPD, they should be at 1333MHz @ 8-9-8-24 @ 1.5v.
I'm running them at 1200MHz @ 9-9-9-24 @ 1.65v.
Corsair claims they can run at 2000MHz @ 9-9-9-24 @ 1.65v.
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
post #35 of 54
Have you tried testing your RAM at all? I might be wrong, but it sounds like if it is failing that quickly during the blend test, it could be memory related.
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
post #36 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
Have you tried testing your RAM at all? I might be wrong, but it sounds like if it is failing that quickly during the blend test, it could be memory related.
Nope. But just did. Same settings as when it didn't fail for +2 hours, failed in about 2 min when doing the Blend test.

Sigh... I decided to start over.
I'm now running a few more tests and I think my limit at stock voltage is 225 x 17.5 (3.9 GHz). Both Blend and Small FFTs running simultaneously, 2 threads each, haven't failed for the past 10 minutes.
I'll run them overnight and see how it goes. If just one of them fails, I'll either play with RAM settings (probably do a Memtest+86) or increase voltage a notch. If both fail then I guess I'll settle with 3.8 GHz until I can find more time to OC.

In any case, thank you very much for your help! I really appreciate it!
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
Ultimate
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 955 BE Asus M4A87TD EVO ATI Radeon HD 5770 2x2GB Corsair Dominator GT 2000 MHz 
OSPower
Ubuntu 10.10 Thermaltake Purepower 650w 
  hide details  
Reply
post #37 of 54
Hmmm, I saw the chart. its probably the chip being unable to sustain such a high oc, very common. Anyway, try this out just to see what happens..... stress test with occt/linpack and see if its stable. Also try the previous setup with cpunb at 2500mhz -- 1.3V.

just noticed it.... if your ram is rated at 2000mhz, run it at that speed. i thought it was 1333mhz model.

ps: thanx for messi
Edited by leopold1985 - 3/26/11 at 10:50pm
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
post #38 of 54
Let us know what happens with memetest.

Could be that your chip just doesn't want to go that high, like leopold1985 said above.

Good luck!
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
    
CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
PowerCase
Antec EarthWatts 650 NZXT Phantom 
  hide details  
Reply
post #39 of 54
Hello. I have almost the same PC hardware.
Iam new to OC.
I have reached 4Ghz just with multiplier, i didnt go highter due temps.
Ref clock is 200, CPU x20(1.45V), CPU/NB x13(1.2V), RAM 800MHz(1600 cl9, 1.65V), HT x10. Other settings i didnt change. No crashes, tested with ITB OK, now Prime95 doing test all OK so far.

I think you should lower RAM voltage to 1.5V if you use it on 667MHz, 1.65V is for 800Mhz and highter.
Lets OC together i need help bro
Edited by StealthRuler - 3/27/11 at 5:28am
Overclocked Dendy
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X4 955 BE ASUS M4A87TD EVO GIGABYTE N450OC2-1GI KINGSTON 2x2GB DDR3 1600MHz CL9 
Hard DriveHard DriveOptical DriveOS
SSD Corsair Forse series 3 WD Caviar Black 1TB Samsung DVD SH-S223L Windows 7 x64 
MonitorPowerCaseMouse
Benq GL2240 550W EUROCASE MiddleTower 550 SPEEDLINK KUDOS 
  hide details  
Reply
Overclocked Dendy
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X4 955 BE ASUS M4A87TD EVO GIGABYTE N450OC2-1GI KINGSTON 2x2GB DDR3 1600MHz CL9 
Hard DriveHard DriveOptical DriveOS
SSD Corsair Forse series 3 WD Caviar Black 1TB Samsung DVD SH-S223L Windows 7 x64 
MonitorPowerCaseMouse
Benq GL2240 550W EUROCASE MiddleTower 550 SPEEDLINK KUDOS 
  hide details  
Reply
post #40 of 54
This is working for me 250 x16 4.0GHz v 1.496 ram 1333MHz v1.659(stock voltage) (6-7-6-19)timings... CPU_NB 2500GHz v1.397

this setup is nice im loving it

I ran prime 95 but it failed.. like in 2 hours... have a question for you guys. is it really bad that my overclock aint stable with in 2 hours of prime 95? max temp was 57c and I idle 30c load 45c.. I been having this setup for quite a while now, and i been playing non stop on battlefieldbadcompany2 lol lets say 6 hours or more havent seen no problems whats so ever. thanks guys


sorry for asking on your thread Santiago
Ehh..
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k 4.5GHz MSI P67A-G45 ZOTAC GTX 560 1024MB OC (994/1990/2100) Kingston HyperX DDR3 1600MHz (9-9-9-27) 
Hard DriveHard DriveCoolingOS
Hitachi 1TB Patriot Torqz 32GB SSD Corsai H50 Push/Pull config Windows 7 Ultimate 
MonitorPowerCaseMouse
LG 23" LCD Cooler Master GX 650w Antec 900 Razer Salmosa 
Audio
Creative Sound Blaster 3D Sigma Gaming Headset 
  hide details  
Reply
Ehh..
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k 4.5GHz MSI P67A-G45 ZOTAC GTX 560 1024MB OC (994/1990/2100) Kingston HyperX DDR3 1600MHz (9-9-9-27) 
Hard DriveHard DriveCoolingOS
Hitachi 1TB Patriot Torqz 32GB SSD Corsai H50 Push/Pull config Windows 7 Ultimate 
MonitorPowerCaseMouse
LG 23" LCD Cooler Master GX 650w Antec 900 Razer Salmosa 
Audio
Creative Sound Blaster 3D Sigma Gaming Headset 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › Phenom II 955 BE - almost stable at 4.2 GHz?