Quick and dirty A64 clocking guide **UPDATE** X2 OC information!

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ratava

Junior Member
Nov 27, 2007
7
0
0
Hi,

First of all, thanks for this great guide, I found it via google and it's really useful.

Before trying it out tho, i used an option in my A8N-E to overclock the system to 10%, my X2 4400 went to 2400MHZ then I tried Prime95 to test and it fails in 3 minutes or less..So I think that's really weird because like I said it's an option in the bios and 200mhz+ is not really a great overclock..i use stock cooler, when prime fails temp is 66ºC, any thoughts?
 
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szechuanpork

Senior member
Aug 24, 2003
455
0
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sometimes the quick option to increase by 10% or 20% doesn't do a good job of increasing voltages, locking agp/pci, and configure memory. maybe your mobo takes into consideration all of the above and something else is wrong. a simple check of the bios to see what the HT is set at or see if your mobo supports agp/pci/pci-e lockwill fix the problem. you could maybe manually change some of the stuff and auto increase the overclock by 10%.

you could also try using arctic silver 5 on your cpu cooler. or even by a better cooler. your stock cooler should handle up to 80% of the potential overclock of your cpu.
 
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ratava

Junior Member
Nov 27, 2007
7
0
0
hey szechuanpork thanks for your reply.

So I cleaned my cooler and the 10% AI overclock worked well (max temp 58º) but it seems i can't go beyond 2400mhz..i've tried to achive 2500 manually setting FSB to 228, 11x multiplier, HTT 4x and memory down to 100 to test prime but it fails after few seconds, tried increasing voltage 1.4 too but didn't help much cuz it failed like after 2 minutes only, so maybe this means i should be happy with 2400? thanks.
 
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bupkus

Diamond Member
Nov 25, 2000
3,816
0
76
Originally posted by: ratava
hey szechuanpork thanks for your reply.

So I cleaned my cooler and the 10% AI overclock worked well (max temp 58º) but it seems i can't go beyond 2400mhz..i've tried to achive 2500 manually setting FSB to 228, 11x multiplier, HTT 4x and memory down to 100 to test prime but it fails after few seconds, tried increasing voltage 1.4 too but didn't help much cuz it failed like after 2 minutes only, so maybe this means i should be happy with 2400? thanks.
Click to expand...

Reduce your HT (not HTT) to 3 and try again. Too high.
 
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ratava

Junior Member
Nov 27, 2007
7
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Thanks bupkus I'll try that when I'm at home, but I thought 1000 or below (228x4) was an OK value? Sry if I'm saying stupid things it's my first time doing this thanks a lot.
 
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bupkus

Diamond Member
Nov 25, 2000
3,816
0
76
Originally posted by: ratava
Thanks bupkus I'll try that when I'm at home, but I thought 1000 or below (228x4) was an OK value? Sry if I'm saying stupid things it's my first time doing this thanks a lot.
Click to expand...

You're absolutely right. Sorry, but I had just awoke and did the math in my fuzzy head. For some reason I multiplied by 5.
 
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ratava

Junior Member
Nov 27, 2007
7
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yes it happens, now too bad i don't know what else to do i guess i'm stuck with 2400mhz anyway.
 
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bupkus

Diamond Member
Nov 25, 2000
3,816
0
76
Out of curiosity, ratava, what core do you have? If you don't know, download and install cpuz(google) and lmk.
Thanks.
 
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bupkus

Diamond Member
Nov 25, 2000
3,816
0
76
Sorry about the delay. A friend just called for advice about a new pc.

The first thing I noticed is your command rate (CR) of 2T. People say AMD users take a big performance hit with that. Change to 1T and look for cpu instability.

Last resort recommendation:
If after all attempts you find you can't go over your current overclock, consider this upgrade. I have 5 in my house now, with 3 that just arrived 25 minutes ago via UPS. I'm assuming that you know how to build.
 
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bupkus

Diamond Member
Nov 25, 2000
3,816
0
76
I thought your Toledo was like my Toledo, but I was wrong. Yours has twice the size cache so I don't know if it overclocks like mine. I can't make any assumptions about its performance potential.
For a while there I was considering that you just have a bad mainboard.
Here's a thought... no... cpu-z says there's 2 cores so the bios must be seeing both cores.
I can't guess why you can't do better in your overclock.
Sorry.
 
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ratava

Junior Member
Nov 27, 2007
7
0
0
i see. thanks for all the useful info.
I think 2400 is the maximum, just my bad luck heh.
 
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Praetor77

Junior Member
Dec 24, 2007
2
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Hi all,

I have always visited these forums for info and help, but just now do I have the need to post something to get an answer! Heh. I have just bought an AM2 Athlon 64 4200 X2, an Asus M2A-VM and a Corsair XMS2 DDR2 1GB 800Mhz.

I am giving my first steps in overclocking, and I really don´t want to walk into dangerous terrain here. After my first try I have achieved a stable 240 FSB with X4 HTT multiplier, actually haven´t tried anything higher. Here´s the CPU-Z screenshot:

CPU-Z
CPU-Z MEMORY

I would love to hear suggestions, specially regarding my RAM I am running it at 2.1 volts, though I haven´t changed the memory speed and it is running at 860 Mhz as you have seen. Is this a problem? Should I run it at 666 instead of 800Mhz in BIOS?

One bad thing about this mobo is that I can´t find (or there isn´t) the possibility to chnage memory timings, I can only change clock (400, 533, 666, or 800Mhz). Suggestions? Should I try 250 FSB so HTT is 1000Mhz with 4X multiplier?
 
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Praetor77

Junior Member
Dec 24, 2007
2
0
0
Oh, yeah, running Orthos for an hour with 2 core cpu and ram tests resulted in MB temps of 37 deg and core temps of 45 degs. BTW, it´s 35 degrees room temp here in Argentina right now...
 
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Gum

Member
Oct 17, 1999
78
0
0
Originally posted by: Praetor77

One bad thing about this mobo is that I can´t find (or there isn´t) the possibility to chnage memory timings, I can only change clock (400, 533, 666, or 800Mhz). Suggestions? Should I try 250 FSB so HTT is 1000Mhz with 4X multiplier?
Click to expand...

when you change the ram speed to 667mhz, the divider will be changed from 6(800mhz) to 7(667mhz). Example below:

Your current CPU speed: 235FSB x 11mult = 2585Mhz
Your current RAM speed: 2585Mhz / 6(800Mhz) = 430Mhz (430 x 2 = 860Mhz RAM speed)
Proposed RAM speed: 2585Mhz / 7(667Mhz) = 369Mhz (369 x 2 = 738Mhz RAM speed)

If you run your RAMs at 738Mhz, you can bring down the Command Rate to 1T and your voltage to default 1.8v. I reckon this will be better in long run. :)
 
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Gum

Member
Oct 17, 1999
78
0
0
Guys, will there be a diff in performance for the below 2 overclocking methods?

1) 230fsb x 11.5mult = 2645Mhz, mem divider set to 7 so ram speed is effectively 2645 / 7 = 377Mhz (754Mhz DDR)
vs.
2) 230fsb x 11.5mult = 2645Mhz, mem divider set to 6 so ram speed is effectively 2645 / 6 = 440Mhz (880Mhz DDR)

My Cosair TWIN2X2048-6400 DDR-800 is currently running at method 1 speed : 377Mhz @ default 1.8v and 5-6-5-18-1T SPD timing. System is very stable.

Not sure if it'll be able to run at method 2 : 440Mhz at the same SPD timing? Hmm...
 
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DerwenArtos12

Diamond Member
Apr 7, 2003
4,278
0
0
That depends on a couple things. Is this an AMD or Intel set-up? In an AMD set-up it will make a minimal if noticable difference in practice, just slightly less of a difference than in an Intel system. Granted, in either system there is going to be a difference in synthentic benchmarks and even maybe a 5% difference in real life benchmarks but, do you think you're really going to notice that?
 
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Gum

Member
Oct 17, 1999
78
0
0
mine's a amd X2 setup. Sorry I didnt specifically mention but I tot the ram speed calculation differs betwn intel & amd?

anyway, now i got my rig running 244fsb x 11.5mult = 2806mhz @ 1.35v, ram speed 802Mhz, timing 5-5-5-12T @ 1.8V. :)
 
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