AMD overclocking ftl

[Splave]

any tips? we will be benching 1090t on crosshair day 2.
Playing with ud4p and 7750BE tonight to get some sort of prep.

[Hondacity]

lol

never oc'd an amd since my first athlon 1g....

at least you'll learn that most of them don't coldbug :D

[DOM]

i have only oc one amd and was the build i did for my mom

its almost he same as intel i think lol up the clocks and give it volts ;) GL

going to use ln2 ?

[Neuromancer]

I have not run thuban yet, I imagine it is different htan the 7750BE, that is kind of old tech

BE clocking is pretty easy though. Basic OCing rules apply unless you are HTREF clocking (which is not a bad idea, since turbo speed is directly related to it...)

I would disable turbo to start though, work the CPUNB as high as you can... might get higher CPU OC with lower CPUNB (IE not 5GHz... ) there is a diminshing return on CPUNB clocking IMHO, although many will say differently.

I found for 4.6GHz on water with phII that I could OC further with only 2.4GHz CPUNB then with the 3+ most people recommend.

That being said... CPUNB effects multi threading and memory performance since it is the bus that allows the cores and them memory to communicate.

Will have to brush up on my voltages though. I can check it out sometime after... 9PM ish EST tonight.

Babysitting right now and gotta pack to go house sit at my aunts house she is going into surgery tomorrow for lung cancer.

So no promises.


Oh... one last thing.. IIRC thuban has an improved IMC so the 1900 ish memory limit should be a bit higher. (1800 as tight as possible will be your best bet on 7750BE, might be able to push past 2K on thuban.)

I would IM Bill though he might have more experience with the new Arch. v(Definitely has more subzero experience than me)

[Splave]

^Really appreciate it neuro

[DrNip]

Sorry bud. haven't overclocked an AMD since my AM2 chip in 2007! Good luck.

[Neuromancer]

Oh one last thing....

I did some vantage testing a couple years back, and dropping HTLINK speed improved CPU performance in Vantage... however it hurt GPU performance (obviously) so for 2D tests.. at least before you go sub zero try running really low HTLINK speeds . 600-800MHz for Spi, pifast etc.

I do not know WHY that seemed to help (less BUS stress on the die?) but it did (marginal maybe 1% improvement)

[Neuromancer]

http://www.legitreviews.com/images/reviews/1362/asus_crosshair_iv_bios_3.jpg

CHIV bios

CPU Voltage = vcore under 1.55 at 50+C load.
CPUNB Voltage = IMC 1.4-1.5 should get yuou some mondo CPUNB clocks under cold. Like 4000MHz
HT Voltage is your hypertransport link to the PCIE slots (and depending on what elese is connected on that motherboard, sometimes LAN, audio, USB etc) I HTREF clock a lot this is essential for that EVEN if you drop the HTLink speed...

1.35 usually stabilizes everything out up to high 5Ghz

NB voltage I forget what this is... I want to say chipset but I think that is the next voltage I usually keep this one at near CPUNB voltage

NB 1.8= chipset. Wont need much here... 1.9-2.0 if anything at all more HTREF really... but.. I always bump iot

SB voltage 1.3-1.35 fro stabilizing raid and other peripherals off the SB when HTREF clocking. Should not need to adjust this much at all up to 240HTREF.

Sure you know what VDDA and REF voltages are.

Microcode update, I have tried on or off. Makes no difference that I can tell...

Core Unlocker/Activation... disabled of course...

I never pushed more than 1.6 - 1.7 on vcore even on LN2, as I could not afford to kill the chips, and also because my system was crashing for other reasons. According to Chew when clocking AM3

"the blue screen is NB vid/IMC memory related, the black screen is core clocks/cpu voltage related and the just crash/dissapear from desktop is temp related"

BSOD I usually go by the stop error code ... black screen = CPU and freeze/ crash to desktop... unstable but still pushable :) could be any number of things really depends on the bench I was running.

You can take that for what it is worth though.



Oh also I thought a coorelation between vcore + cpuNB vid = VDDA might be worth trying out.. not cast in stone though

[Splave]

alot of great info there man!

been clocking the 7750
see anything thats outs of whack?

[ReverendMaynard]

alot of great info there man!

been clocking the 7750
see anything thats outs of whack?

High NB frequency is king. Also low latency is better than fast ram speed.

1.8-1.9v on LN2 should get you up in the mid 6ghz range. HTT multi always at 10x no more, no less.

[Neuromancer]

Try lowering HTLink, raising CPUNB and see if you can get that vcore under control. Heat is your enemy on these, less heat less voltage needed. I never had a Kuma core though. Closest I would say I had to that is the 9950 (Both are Phenom I ) the 1090 is going to blow your mind after practicing on that Kuma core :) Hell the 550/555BE will blow your mind after that LOL

CPUNB will probably crap out around 2400 on that gen... on air/water and not much further colder IIRC...

When is the competition? I need to pick up a cool running AM2 chip for my nieces PC I just built her (have the 555BE in there now but its not "recognized" ) I can send you my Crosshair III and 555BE to practice on. Board is fresh from RMA new mobo this time instead of repair to old...

Depending on your sticks, 500 4-4-4 should be easily doable even on that old ass IMC.

EDIT: 1:1 HTL/cpuNB for wprime? interesting.... it is worth a shot. Vantage CPU test definitely sees an improvement in dropping HTLink... (and raising CPUNB of course) and that is multi threaded... try it though.

[ReverendMaynard]

EDIT: 1:1 HTL/cpuNB for wprime? interesting.... it is worth a shot. Vantage CPU test definitely sees an improvement in dropping HTLink... (and raising CPUNB of course) and that is multi threaded... try it though.

It's not really multi-threading that makes the difference with Vantage CPU neuro, it's the fact that it's graphical and using other components. Allot of the other stuff you've laid out is bang on, just adding my 2 cents :)

[Splave]

awesome you guys are right, ht link gains no time and nb frequency was huge change :) mem is junk tryed 1066 cas 5 no go.

Heat is def stopping me at this point. 3300mhz was the cap until I put rad infront of AC than 3.5ghz was my best 2400nb 1600HT link.

Think I get the idea now, also 9 out of 10 times the 2nd run was .2s faster. big difference.

[Neuromancer]

oh yeah I forgot that..2 runs ftw same as Spi. :)

Also wprime32M test... 3 threads on a AMD dual core. hurts on the long test though. Might not be all archs...

It sounds weird but it always seemed to work better for me