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Should i push my BCLK overclock further? - Page 2

post #11 of 18
Thread Starter 
Quote:
Originally Posted by looniam View Post

personally i like to keep the voltage down just above getting a BSOD while stressing/gaming/benching. iirc i saw a 3c/5c temp decrease idle/load by using a negative (-) offset of 0.120 (the first red in the BIOS) idle is 0.955 and 1.228 on load in cpu-z 103BCLK@ 36 multi for ~3.7Ghz; your milage may vary.

look in all honesty there is always danger when running anything out of specs. depending on how long you have had your BCLK raised, if you haven't gotten a BSOD or failed to boot, chances are you're fine.

Ok. ATM i lowered my bclk to 100, and im just running 4 ghz. Mainly because when i raise the bclk it changes the ram frequency to weird numbers and overall my ocd kicked in and wouldnt let that slide. As far as i know theres no way to get passed that until hitting ridiculously high bclk numbers ie 130-160 something when the frequencies finally even out. Kinda pissing me off. i really want 4.2 just to say i got there, plus with streaming any speed increase helps. One thing that is very frustrating is that in my bios i can set my cp ratio to 42 just fine, but when i boot into windows all my programs show it at 40 not 42, and my cpu runs at 4 ghz and wont go past it. Then when i load back into the bios it still says 42, but its not running there. Ive heard about maybe having to change the turbo boost power limits? so frustrating ;p
 
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post #12 of 18
Quote:
Originally Posted by willll162904 View Post


Ok. ATM i lowered my bclk to 100, and im just running 4 ghz. Mainly because when i raise the bclk it changes the ram frequency to weird numbers and overall my ocd kicked in and wouldnt let that slide. As far as i know theres no way to get passed that until hitting ridiculously high bclk numbers ie 130-160 something when the frequencies finally even out. Kinda pissing me off. i really want 4.2 just to say i got there, plus with streaming any speed increase helps. One thing that is very frustrating is that in my bios i can set my cp ratio to 42 just fine, but when i boot into windows all my programs show it at 40 not 42, and my cpu runs at 4 ghz and wont go past it. Then when i load back into the bios it still says 42, but its not running there. Ive heard about maybe having to change the turbo boost power limits? so frustrating ;p

i feel your pain but no, the best you can do is go 4 "bins" above the default turbo boost. even though i also see a higher ratio in the bios settings (38) the highest i do get for all four cores is 36. i was under the impression that enabling Multi Core Enhancement (MCE) would allow be to run it higher and even got into an argument with a respected member of the community; this forum among others. turns out he was right.

when it really boils down to it, i have 103 just for the feeling of getting a few points in cinebench and a couple of Mhz on the RAM, as you noticed yourself. i am sure the 0.003 seconds faster it takes to encode a video is almost pointless but the bottom line is having the feeling of getting a little something for nothing. redface.gif

the first time i ever overclocked anything was setting the jumpers on a FIC motherbord to a 85Mhz bus speed instead of 66, oh boy! was i rocking that 233MMX @ 266! tongue.gif
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post #13 of 18
Thread Starter 
Quote:
Originally Posted by looniam View Post

i feel your pain but no, the best you can do is go 4 "bins" above the default turbo boost. even though i also see a higher ratio in the bios settings (38) the highest i do get for all four cores is 36. i was under the impression that enabling Multi Core Enhancement (MCE) would allow be to run it higher and even got into an argument with a respected member of the community; this forum among others. turns out he was right.

when it really boils down to it, i have 103 just for the feeling of getting a few points in cinebench and a couple of Mhz on the RAM, as you noticed yourself. i am sure the 0.003 seconds faster it takes to encode a video is almost pointless but the bottom line is having the feeling of getting a little something for nothing. redface.gif

the first time i ever overclocked anything was setting the jumpers on a FIC motherbord to a 85Mhz bus speed instead of 66, oh boy! was i rocking that 233MMX @ 266! tongue.gif
Ok but four bins above the default turbo for me is 42, meaning i should be able to get 4.2 just fine. I get 4 ghz perfect, no issues whatsoever. Why wont it pass that?
 
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post #14 of 18
the confusing thing is the highest turbo speed is single core; it will hit that on one core but, with a load on all 4 cores it will back down 2.

EDIT: the tables are here
http://www.intel.com/support/processors/corei5/sb/CS-032278.htm
Edited by looniam - 8/11/13 at 1:07am
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post #15 of 18
If you really want to push it, since this is Overclock.net afterall, disable spread spectrum, VCCIO on 1.1v, VCCSA on ~1.0v, and push that BCLK like mad haha.

I tested my BCLK on the 2500K using only my bench os SSD hooked up and got as high as 109.4Mhz SuperPI stable. Even tho random stuff kept crashing (xxxxx has stopped working..) in windows haha.
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post #16 of 18
Thread Starter 
Quote:
Originally Posted by looniam View Post

the confusing thing is the highest turbo speed is single core; it will hit that on one core but, with a load on all 4 cores it will back down 2.

EDIT: the tables are here
http://www.intel.com/support/processors/corei5/sb/CS-032278.htm

Oh! so your saying it may be running at 4.2, but while gaming or running prime, it backs down 2 cores to 4 ghz? I see. Overall, if you were in my shoes, running 4 ghz fine temps totally stable, would you suggest pushing my bclk to 105-6 and getting 4.2 ghz? I really want to but i need to be totally stable. Also will the slight change in ram freq. do much negatively? With that bclk i was running stable gaming and priming for a little over a day no artifacts, crashing, anything out of the ordinary.
 
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post #17 of 18
Quote:
Originally Posted by willll162904 View Post

Oh! so your saying it may be running at 4.2, but while gaming or running prime, it backs down 2 cores to 4 ghz? I see. Overall, if you were in my shoes, running 4 ghz fine temps totally stable, would you suggest pushing my bclk to 105-6 and getting 4.2 ghz? I really want to but i need to be totally stable. Also will the slight change in ram freq. do much negatively? With that bclk i was running stable gaming and priming for a little over a day no artifacts, crashing, anything out of the ordinary.

how long were you running prime? sometimes it takes hours before an error will show.
i'll be a bit more detailed about what i have done. i got a p8H67-V feb of 2012 with a i3-2120 and ran a 103 BCLK because enabling the asus gpu boost did it and thought it ought to be ok. didn't have any problems whatsoever with some PNY 1333 RAM for about year. grabbed a i5-2400 and still no issues then got the p8z77-v pro and some low voltage 1600 (1.35) with 103. i did have to up the dimms to 1.40 because of getting rounding errors in prime pretty quick. still haven't had a lick of problem for over 6 months.

i have seen a review site overclock all sandy/ivy with a 105 BCLK at the end of last year.
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i really believe it depends alot on the motherboard. to be honest, on one hand i do not fall in with the "naysayers" and give a knee jerk reaction that something cannot be done. however i am not comfortable with telling you, YES! raise your BCLK to 1XX and you'll be fine. though 105 seems reasonable but i cannot tell you in good conscious that it will be fine. i have seen folks hit 106 w/o a problem but some can't do 104, it does vary. just don't jump on what you want but slowly go forth easily.
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post #18 of 18
As I said 2 posts up, just to follow up on what you said now, I can do 109.x for benches semi-stable but what I run 24/7 on my 2500K is 104.1x49 = 5100.9Mhz. (Normally it's x51 for 5.3 but my H100i is out for RMA and the H220 isn't in yet. CNPS10x P can't cope with 1.48v)

Why the BCLK? Cause my RAM really loves to run at 2200 ish Mhz (now 2220Mhz) with great timings so I need to extra bclk as a Sandy can't do 2200Mhz native.

It runs stable as a rock on a P8Z68-V Pro with offset +0.035 (1.400v actual) and undervolted VCCIO at 0.9875v (1.00v actual) and stock VCCSA. DIMM's run at 2220Mhz 9-11-10-24-1T @ 1.64v.
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AMD Athlon XP-M Barton @ 2612Mhz ASUS A7N8X-X HIS Radeon X800XL 256MB w/ V-MOD @ 585Mhz GPU 5... 3x512MB Samsung PC-3200 CL3 
Hard DriveCoolingOSOS
Maxtor 80GB IDE Cooler Master alu/copper block with a Slipstrea... Windows 98 SE Windows XP Pro SP3 
PowerCase
Cooler Master Real Power M520W OEM with great airflow and even cable management 
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Thundahcat.
(20 items)
 
   
CPUMotherboardGraphicsRAM
AMD Athlon XP-M Barton @ 2612Mhz ASUS A7N8X-X HIS Radeon X800XL 256MB w/ V-MOD @ 585Mhz GPU 5... 3x512MB Samsung PC-3200 CL3 
Hard DriveCoolingOSOS
Maxtor 80GB IDE Cooler Master alu/copper block with a Slipstrea... Windows 98 SE Windows XP Pro SP3 
PowerCase
Cooler Master Real Power M520W OEM with great airflow and even cable management 
  hide details  
Reply
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Overclock.net › Forums › Intel › Intel CPUs › Should i push my BCLK overclock further?