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^ Yea, I edited it. I was having frustrations with some overclocking, turned out to be a totally irrelelvant issue screwing up my cpu.

Quote:
Originally Posted by Kryton View Post

Quote:
Originally Posted by Belial View Post

Phenom ii 955, I'm having trouble pushing 3.6ghz and above, no matter the voltages (1.502-1.568vcore, seems like temps might be a limiting factor in stability as well, but im keeping lower than 60*C).
It appears that ACC might be helpful to overclocking this cpu:
http://www.bit-tech.net/hardware/cpus/2009/05/11/overclocking-amd-s-phenom-ii-x3-720-be/1
http://www.overclock.net/t/547258/any-idea-what-acc-advanced-clock-calibration-do-to-phenom-ii-x4/0_100
I'll add more info as I scour the internet, but it seems more than one individual found ACC +2%+ helped them out. Who knows how reliable that information is though, is that for prime95 12+ hours stable, or just booting, but that's what this discussion is for.
On a side note, I was curious if just increasing CPU-NB speed would help cpu stability. I seem to see a few people saying that, but nothing really definite (maybe they meant cpu-nb voltage).

Man, this thread kinda exploded... headscratch.gif

I'll say with the experience I had with my MSI 790FX GD70 that setting each core using ACC was useful in helping weaker cores run with more stability on a core-per-core basis but I noted no actual gains in max MHz (Suicide runs), only that it seemed to help extend the max OC'ing "Stablity" range of my chips before they went wonky and crashed. Not saying that you or anyone else didn't go farther with the same CPU voltage when tweaking with ACC , that's just the experience I had with it.

I will say though ACC itself used to tune the indiviual cores of a chip could enhance your stability if you have a core that acts up early compared to the rest but doesn't do anything if wanting to see how far you can actually push the chip in MHz as in to the max. Yes, folks have used it also to help unlock hidden cores that otherwise would not have worked by changing values on a "Per Core" basis.

As for using it to actually OC a chip, no it doesn't do that - It's just another tweaking tool you can use to improve stability but it does work at least provided it's used properly.

I'll also say increasing CPU/NB speeds alone will improve RAM performance but like anything else, the higher you go, the greater the chance instability could set in and that's gonna depend on the chip itself. Of course you'd need more CPU/NB voltage too but that's a double-edged sword in that the increased voltage there will make the chip run hotter as well.

Could be wrong here BUT that's my take and experience with it to the best of my memory. Too bad the named board is now dead (Which is why I'm having to remember all of this) and my CHV doesn't seem to have the ability to tweak indiviual cores that way - Or at least I haven't seen that in the BIOS itself yet but I'll admit I haven't really looked for it either. redface.gif

What did you set ACC too on each core? How did you know what to set them too?

I mean, 99% of my prime95 fails are resets/bsods/freezes, I've only gotten core/worker failures like once or twice. And you can't exactly tell by synchronization or worker failure anyways, i mean, background applications are only using certain cores, so there's not a perfectly even load between the cores, its not a huge deal but it makes it hard to figure out which core needs what.

I mean, how exactly would you, and did you, go about setting it? How do you know a core is bad? Were you having lots of worker fails? I mean the few times i did get worker fails, it's always been 4th core (core #3)... but like i said, doesnt happen often at all. Maybe to some people/chips it happens a lot more?

What about ACC to auto?

Well obviously cpu-nb increases performance (ive seen conflicting reports on more cpu-nb is better vs sweet spot frequency, but from what I understand it entirely depends on your RAM speed, and i'll do some benching once i start tweaking my cpu-nb anyways). I am aware cpu-nb-volt gives additional heat though.

I'm not confused on cpu-nb stuff, i was just wondering if cpu-nb frequency, and volts, coudl be used to stabilize/increase a core clock.

Thanks for your feedback though, very valuable. I'll push my chip, and once I reach a limit, I'll see if I can push 5-10mhz more with ACC, to see if it works for my chip or not, at which point I'll report back ^^
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Build In Progress
(17 items)
 
   
CPUMotherboardGraphicsRAM
Haswell i7-4770K 4.8GHz@1.452v/1.97vRIN Gigabyte Z87X-UD3H Older Gigabyte 7950 (H60 Mod) 2x4GB Gskill 2400CL11 Hynix CFRs 
Hard DriveCoolingOSMonitor
Samsung 830 128gb Corsair H110 w/4x 140mm Yate Loon High Blues W7 x64 Ultimate Yarrgh Matey Dell U2312HM Matte IPS 1080p 
MonitorMonitorKeyboardPower
Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
CaseMouseMouse PadAudio
Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
Other
Bitfenix Recon Fan Controller Moded 
CPUMotherboardGraphicsRAM
Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
Hard DriveCoolingCoolingCooling
Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
OSMonitorMonitorKeyboard
Hax'd W7 Ultimate 64-bit Sanyo DP19640 19'' KDS Radius Rad-7xp 17'' Ducky 1087 MX Brown 10keyless 
PowerCaseMouseMouse Pad
Rosewill Capstone 550w Modular NZXT Source 210 w/Modded Window Razer Deathadder 3.5G Steelseries Blizzcon D3 
AudioAudioOtherOther
Phillips FW-C250 2 Speaker Set w/3 CD Changer JBL Sub 6 Subwoofer NZXT Sleeved LED Strip 1m Blue NZXT Sentry 2 Fan Controller 
Other
Colonial Blue Paracord Sleeving 
CPUMotherboardGraphicsRAM
Phenom ii X4 955C2, $31, 5 broken pins, works! ... Biostar A770e3 6.3 Red&Black MSI GTX 460 768mb Twin Frozr II 2 x 2GB Kingston HyperX 1333 OC to 1348CL7@1.65v 
Hard DriveCoolingCoolingCooling
Intel X25-M G2 80GB SSD NH-D14 SE2011 6 x Case Fans (4 x YL-M, NZXT case fan, CM Hype... Jerryrigged Chipset-Northbridge 80mm HSF 
CoolingOSMonitorKeyboard
Jerryrigged VRM Heatsink (sawed off stock AM2 h... Hax'd W7 Ultimate 64bit Sanyo DP19640 19"1360x768 Ducky Cherry Browns 10keyless 
PowerCaseMouseMouse Pad
Antec Earthwatts 430D NZXT Gamma Steelseries Kinzu Optical Steelseries Blizzcon Diablo 3 
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