Tips for Overclocking. 27 replies

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rob.

I am the Walrus

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24th October 2004

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#1 12 years ago

I can't remember how many overclocking threads I have made, so I apologise for my ignorance on the whole topic.

I am really having a hard time seriously overclocking my 3700+ on my ASUS A8N-SLI board. Anything over 2.6GHz just hates me. The Ram will go right up and cause instability. Now, you would say "Well turn down your Ram and Memory Bus". I can't. I think it might just be this board in particular. But I cannot use a memory divider, or turn down teh Memory Bus.

The processor is able to go to 3.0GHz. I know this as I have witnessed it.

So what I would really like (Especially guys with the 3700+, and or A8N-SLI board), to give me some information on how to overclock it without it going insane. Even share some information on what your clocks are, and what your settings are in the BIOS.

I have used A64 Tweaker to somehow apply a memory divider, but this just resets itself everytime I reboot, and I don't feel happy changing settings via software in windows. I much prefer BIOS settings.

Thankyou to anyway who can share some of their overclocking tips.

PS - Specs are in Siginature, and cooling isn't an issue.




C38368

...burning angel wings to dust

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14th February 2004

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#2 12 years ago

ASUS did one thing with the A8N series (and possibly other AMD boards) that I really come to hate: they put in standard dividers for each of the major DDR speeds (333, 400, etc), but none of the other and more useful dividers, like 11/12.

Using the traditional FSB ratio, this wouldn't be a problem. However, AMD memory controllers now use a combination of the HTT bus, CPU multiplier, and ratio to determine RAM speed. For myself, this has put me in a situation where I can't get my RAM any higher: if I bump up to the next setting, the BIOS either won't keep it, or it'll launch my RAM to about 320MHz (DDR640? It's good stuff, but not that good).

Once you've hit the top stable clock for your CPU, that really limits your ability to overclock the RAM, from what I've seen. I can lower the CPU multiplier and raise the HTT bus, but the CPU and memory clocks remain largely the same.

What are your HTT, multi, RAM and voltage (both Vdimm and Vcore) set at?




deathwarder

Part of the EPA's swat team

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#3 12 years ago

Does the htt bus work like the fsb?




rob.

I am the Walrus

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24th October 2004

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#4 12 years ago

C38368ASUS did one thing with the A8N series (and possibly other AMD boards) that I really come to hate: they put in standard dividers for each of the major DDR speeds (333, 400, etc), but none of the other and more useful dividers, like 11/12.

Using the traditional FSB ratio, this wouldn't be a problem. However, AMD memory controllers now use a combination of the HTT bus, CPU multiplier, and ratio to determine RAM speed. For myself, this has put me in a situation where I can't get my RAM any higher: if I bump up to the next setting, the BIOS either won't keep it, or it'll launch my RAM to about 320MHz (DDR640? It's good stuff, but not that good).

Once you've hit the top stable clock for your CPU, that really limits your ability to overclock the RAM, from what I've seen. I can lower the CPU multiplier and raise the HTT bus, but the CPU and memory clocks remain largely the same.

What are your HTT, multi, RAM and voltage (both Vdimm and Vcore) set at?

Yeah it is a real pain.

At the moment, I am at stock. But the most stable thing I could get was my HTT at 237MHz with a 4x HTT multi, and 11x CPU. Ram was at 333 for a while, then I did it the lowest it could go (I think 200), but that did nothing, vdimm were at 2.8, vcore was at 1.5.

Does the htt bus work like the fsb?

Effectively, yes.




C38368

...burning angel wings to dust

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#5 12 years ago

Will your computer POST if you set the memory correctly, at DDR500?




rob.

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#6 12 years ago

I will try that out, and post back results.

I appreciate your help and time. Thanks. :)




MG42Maniac

A man of dubious moral fibre

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28th May 2003

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#7 12 years ago

Well I hate to say it but my Overclocking with my AMD64 3700+ & DFI Lanparty Ultra-D was a piece of pie. I have some G.Skill Ram PC3200 @ 2-3-2-5 which will do ~215Mhz at stock timings.

I started by wacking on a divider at 166 and then raising the HTT till I got a clock speed of 2.4Ghz then I went too 2.8Ghz dropping the divider ever lower but had to raise the CPU Volts to 1.475 to get it prime stable which was not a problem as i've got an Artic Cooler 64 Pro. At this point I had like 260 HTT so I had to drop the HTT multiplier even though my board can handle a stupidly high HTT. I've now underclocked it too 2.6Ghz and lowered the CPU Voltage to 1.425 as we are getting really hot weather so my room has turned into an oven. I can't say much about the Asus BIOS as i've never owned one but the DFI BIOS is really awesome and gives you all manner of options and my next motherboard will definetly be DFI.




Oblivious

I tawt I taw a puddy tat...

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#8 12 years ago
Kommandant Ro╬▓Yeah it is a real pain. At the moment, I am at stock. But the most stable thing I could get was my HTT at 237MHz with a 4x HTT multi, and 11x CPU. Ram was at 333 for a while, then I did it the lowest it could go (I think 200), but that did nothing, vdimm were at 2.8, vcore was at 1.5.

Your new ram is ddr500 right? Would these settings below work? I'm not sure what your motherboard can do.

FSB - 255 CPU multiplier - 11x (2805mhz) HTT/LDT multiplier - 4x (1016mhz) Memory clock (limiter)- 200 (255mhz - ddr510)

(or)

FSB - 267 CPU multiplier - 10.5x (2804mhz) HTT/LDT multiplier - 4x (1068mhz) Memory clock (limiter)- 183 (244mhz - ddr488)

Not sure, but I'd imagine a (0.1 - 0.125) voltage increase on the cpu, and stock voltage on the ram would be prudent. More if it's unstable.

If it's this stuff, I've read that the ram can take up to 3.15v without voiding the warranty and it can handle more if your board can supply it.

I'm a bit green at OCing myself, so I'd be interested to see how it goes for you. Good Luck! :)




rob.

I am the Walrus

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#9 12 years ago
C38368Will your computer POST if you set the memory correctly, at DDR500?

Ok, when you say correctly at DDR500. Do you mean to say, that my memory is DDR500?

I thought it was DDR400. Well I set it to 500MHz in DRAM config, and when it rebooted it posted back to DDR400.

Thanks for the help once again.




C38368

...burning angel wings to dust

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#10 12 years ago

You bought PC4000, Rob. That's DDR500.

Thing is, though, that if you set the HTT to 250MHz and select DDR400 in the BIOS, you'll wind up with an effective memory speed of DDR500. I'm guessing that at 250MHz HTT, you won't be able to POST at the DDR500 option, but I'm curious...