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Hi as per title,
I have started working on my CPU-NB frequency and am looking to find data of what other peeps are using.
Id prefer peeps to post their frequency and voltage along with the type of stability testing they have used.
I am currenly testing
2800mhz @ 1.325v using prime95 blend....
2660mhz @ 1.2625V primable
2670mhz Prime 95 blend I got error within several minutes, no matter how much voltage I pushed, it never got pass the test.
over 2700mhz no post at all. :(
C3 955 0942DPMW, not a good chip, is it?
for cpu@3.8 cpu-nb@2.6/1.275V
for cpu@3.7 cpu-nb@2.6/1.2625V
955 C2 0911EPMW, >12h p95 x64 blend, 20 pass linpack x64 at 3072MB
965 C3 0945DPAW @ 4116MHz 1.5625V
CPU-NB 2820 1.275V
Blend stable
Makes about 3000 with 1.45V, 3050 with a nice voltage bump to 1.55V.
But I should mention that this is the chip with the best CPU-NB I've ever had!
Haven't tested thoroughly the other CPUs for NB. It's varying from chip to chip. For example, my second 965 can't handle 2.8, regardless voltage, but all others can reach CPU-NB close to 3GHz on water:
X2 550 C2 @ B50 (0925APMW)
965 C3 (0945DPAW)
965 C3 (0952GPMW)
955 C3 (0952CPMW)
2500Mhz @ 1.245v (stock air cooling)
That's with the chip @ 3600Mhz on 1.36v and HT at 2400Mhz.
2940MHz 1.4v prime blend stable, 3050MHz benchstable with 1.45v.
2676mhz blend stable with 1.33v (not 100% positive if thats the lowest i can go on volts but its close)
C2 550 X4 @ 4000mhz CPUvid 1.53v /2600nb NBvid @1.32v good for 2800mhz
... The NB Multi @ 10x = 2000,,@ 13x = 2600..
Volts scale..use for C2/C3....(C2 will use +.05 to +.10v vs C3 in most cases above 2600mhz. All depends on how high the CPU Multi is Clocked with using High NB.
http://i168.photobucket.com/albums/u...tifreqency.jpg
Older Phenoms,,
B2/B3 will use way more.
athlon ii 250 @3,75Ghx 1,31V / NB 2856Mhz cpu-nb 1,25V def. / HTT 357Mhz NB 1,25V def. / Stable 24/7
mainboard Biostar TA790GXE mATX
http://img85.imageshack.us/img85/346/fffffffj.jpg
*******************
athlon ii 250 @3,5Ghz(OC light) / NB 2800Mhz cpu-nb 1,25V def / HTT 350Mhz NB 1,25V def / Stable 24/7
mainboard Biostar TA785GE mATX
http://img690.imageshack.us/img690/4807/aaaaaaagz.jpg
:)
4ghz 2676mhz @1.35v blend stable
My 965BE C3 does a mere 2.6GHz at 1.2V, 2.7GHz needs 1.35V! This must be one of the worse CPU-NB's ever. My old 955BE did 2.8GHz at 1.275V and even my old 940 could do 2.8GHz at less than 1.3V.
Nope, It's not! This one has very weak CPU-NB. I can hardly go over 2.6 with it, regardless voltage...
http://g.imagehost.org/t/0782/prime_4GHz_1_425V.jpg
Crappy 2456Mhz, stock nb volts 1.2v.This damn foxconn doesnt have any nb vid regulation ;-(
2612 @ 1.25v
2.9 Bench stable @ 1.425-1.45v
940BE (0850 I think? launch week CPU) @ 3.8
2720mhz @ 1.425v
Is that 24/7
If you're asking me, yes.Quote:
Originally Posted by Hell Hound
Air or water and how long has it been running.:up:
2.8 ghz nb @ 1.25 v Piece of cake..
All the way up to 3ghz easy with 1.3v
All this all the way up to 4ghz +++ for cpu...
I must be lucky:D
4.008Ghz @ 1.46v CPU
2.5Ghz @ 1.275v NB
Prime stable.
Water, about a month. Spend the previous year at 1.375v or so on air. If it dies, it will be because I'm running 1.63Vcore.Quote:
Originally Posted by Hell Hound
http://www.google.com/url?sa=t&sourc...pt6ZwKH_IqxUAQ
Check the second to last page, says up to 1.5V on air :shrug:
Nah,mines worse, it will not go over 2.5Ghz no matter what the voltage, although will run 24/7 at 2.5 with 1.245v...Quote:
Originally Posted by Zeus
Even to run the RAM at 1600Mhz it needs the NB-CPU voltage bumping to 1.325v
Got bored... is prime96 blend enogh to test stabilty on the IMC/NB?, i wonder one thing has the memmory clocks any impact on stabilty on nb/imc? higher memmory clocks lower nb clocks?
So fair 2800mhz nb @ 1.25v prime95 blend 7min+
Here comes 30min+ screen....
Funny board...sett 1.55vcore in bios give ~1.48 real vcore. This is not max mhz on cpu... only for fast nb test. ops a mistake in screen...2x cpuz same window.
http://i674.photobucket.com/albums/v...ime95blend.jpg
The main thing that stands out when you go through all the clocks through the forums is:
Why the bloody hell didn't AMD spec a 2.4Ghz CPU-NB frequency to start with?!
i think people forget that we have like perfect environment for our pc's so ours are able to do 2400mhz nb on default nb volts, but some guy who lives on the equator w/ a super dusty case in the middle of july might not be able to get 2400mhz stable w/ default volts ;)
But looking at the specs from the document above, the CPU-NB can withstand significantly higher voltages anyway? (Since it's part of the CPU, I would assume it could take the same as the chip does?)
My Northbridge is fantastic on my chip. On the temporary board I'm using right now it's a little harder to clock needing a bit more voltage. Well...anyway the results of my 3 boards are as follows (all using 3.2Ghz @ 1.168-1.232v cpu)
ASUS M3A32-MVP
2.8Ghz @ 1.26v Prime stable
3.0Ghz tests fine, but didn't try for prime stable past 1.35v (boots 1.25v no problem)
ASUS MA78T-E
2.2Ghz @ 1.075v
2.4Ghz @ 1.100v
2.6Ghz @ 1.160v
2.8Ghz @ 1.260v
3.0Ghz @ 1.370v (boots @ 1.25v as well, again didn't test Prime95 just wPrime and SuperPi 32M benching)
Gigabyte MA770T (current temp board)
2.2Ghz @ 1.075v
2.4Ghz @ 1.150v
2.6Ghz @ 1.200v
2.8Ghz @ 1.270v
3.0Ghz @ ...1.400v just to get into windows and run! O__O
The only board I've used that has had any NB clocking issues was the Gigabyte, but it's an $80 budget board so that's expected although the board is awesome! My chip is a Phenom II 955 C2 stepping model using air cooling as usual. Tested with Xigmatek HDT S-1283 and Cooler Master V8 (both lapped as well as the processor). I'm not sure which board I'm going to go with for the next one just yet, likely it'll be the Crosshair III but I'm enjoying this 770T temporary board a lot! :)
Kei
Very good CPU-NB, Kei :) I just tested the one on my 955. I might be having issues with this Gigabyte MA790FX-UD5P in clocking CPU-NB. My old Asus M3A78-T seems better for that,
I will check with the first 965, which easily made 3000MHz stable on CPU-NB with 1.45V on it.
Prime stable
2736 1.3V
2808 1.325V
2860 1.4V
2873 1.45V
2886 1.525V
2899 not stable with any voltage
HmmmQuote:
Originally Posted by I.nfraR.ed
2800 1.25v easy for me but after 2800mhz its very hard...2850-2900 1.3v-1.4v no go. Will test more later.
lastviking: good, with 1.25V its great! How is your NB voltage (not cpu-nb)? I need 1.35-1.375V up 2800Mhz
Auto...i will try more when i get my new board.Quote:
Originally Posted by FlanK3r
They did for the 6 core Opterons (24xx).Quote:
Originally Posted by Rippthrough
Phenom 2 (still needs to) run on the older AM2 boards, with no separate
power plane for the CPUNB - that's probably why.
I forgot that the HT link (system bus) is higher then NB on the Istanbuls;Quote:
Originally Posted by SocketMan
so it's 2400mhz (4800 DDR) for the Hypertranport and 2200 for the NB.
http://products.amd.com/en-us/Optero...&id=553&id=568
Yes, I think this would be the case, once I have some free time I will check this.Quote:
Originally Posted by Lastviking
But it would make sense that the CPU-NB would be stressed more with the memory running at higher frequencies.
Thanks for all the posts peeps, this is great.
Now people can come here and get a clear idea of what voltages people are running to achieve said overclock.
:)
PII 965 0952 - NB 3000Mhz 1,40V
Asrock AOD790GX
http://img709.imageshack.us/img709/4333/ccccg.th.jpg
Tight timings and high freq will indeed stress your IMC more.Quote:
Originally Posted by mongoled
Cinebench is cool for quick stability testing. Prime95 blend, and four threads of memtest (hci design) is nice when you want o make sure the rig is up for 24/7 usage.
I got 3000 NB at 1.475V. Stable enough for some 1M's, 32M's. But momentally reboot after few second Prime blend start. Even at 1.55V i get BSOD after few seconds.
2800 NB even at 1.375V more stable, Prime dont BSOD, dont reboot, but CPU#1 always FATAL ERROR (rounding). (Other tests shows that its weak Core in my CPU)
P.S. I got 4Ghz at stock voltage stable enough for some 32M. But Prime didn't BSOD/reboot only with more then 1.475V. (Weak Core error)
I'm running my NB Freq at 2600@1.2v with Phenom II X4 955 at 19x200@1.4v ~3.8GHz. Super_Pi 1m and 32m stable.
CPU 3600mhz NB 2800mhz. Both 1.45volts. Air Thermalright extreme 120.
Have been running this from day 1. Needs more than 1.43volts for the NB to get that high. I didn't test too see how low I need it but it would crash at 2700mhz with 1.43volts fairly quickly. I could possibly lower CPU voltage if I tried but it is stable and has never crashed on me since I settled at those settings.
Never done any real stress testing but 4-5hour sessions of TF2 don't make it flinch so it is good enough for me.
Have changed from an Asus M3A78-T with 2x1gig DDR2 800 4-4-4-12 to a Gigabyte MA790X-UD4P and 2x2gig DDR2 900 at 4-4-4-12(slots 3 and 4 as well since the HS blocks slots 1 and 2 for tall mem sticks). Has run the same in both boards, no noticeable difference.
I tried yesterday max NB clock with ambients and i got about 3070MHz for superpi 1M. If i tried about 3100 MHz, PC crashed...
release week 940 - 2500 NB with 1.35v 2600 only posts with 1.55v - but wont even pass the torture of loading memtest cd!
fyi - I notice that when nb is clocked to high, or core volts to low winrar benchmark starts to turn in very low scores while rest of windows is ok. firing up prime usually results in hard reboot. - perhaps worth charting your winrar scores as you wind it up, once they start falling, you know your past a limit and can act without getting a crash.