3700+ Overclocking Advice

[herman368]

I've recently been trying to overclock my A64 3700+, however it has been quite tricky because of my Corsair Value Ram.

I have set my memory to DDR 333 and using the formula: FSB * 333/400 = Ram Clock (ie 200 max) I figured that at DDR 333 the max FSB I can have is 240. This, with a 11x multiplier should give 2.64 Ghz.

Problem is, the computer won't boot with these settings, it'll post but once windows start to boot it decides to reboot. I have tried lowering the HT Multiplier fiddling the Vcore / Vchipset settings to no avail.

The best overclock I have gotten (stable) is with DDR 333 and the Asus AI 10% overclock. The best unstable overclcok is 2.6Ghz (FSB 236). It boots but prime95 gives me errors.

(Btw the reason I want to overclock is just to watch apple trailers in 1080p!)

[e36Adz]

I attempted to overclock my processor for the first time last night, previously having no experience at all.

Iv got an X2 3800 which runs default at 200 X 10.

I upped the voltage from 'auto' to 2.9V for the DDR, and 1.5V for the cpu. Then, I increased the CPU Freq to 240, leaving the multiplier at X 10. So, its currently sat at 2.40Ghz quite happily, although the temps are slightly on the high side.

So if I was you I would set the voltage at high (but safe) settings, and then go from there, thats what I did anyway. BTW I take no responsibilty if you fry anything

Sorry I cant be off more help!

[Hottentot]

Not all A64s will overclock to 2.6 Ghz and the voltage required will vary.
Maybe your CPU will only do 2.5. You may need extra cooling to get to 2.6 Ghz.
Its a lottery.

[cptwhite_uk]

Remember to turn the Hyper Transport Bus to 800 ...ie '4x' mode....so the Hyper Transport is running at 4x FSB = 4x240 = 960Mhz ...(default is 1000 (ie. '5x' mode) = 5x200 = 1000)

[scrandman]

In addition to the above, the 240 with DDR 333 divider = 200 is only true for a CPU multiplier of 10. For an 11 multiplier, the actual RAM speed with 240 is more like 188.

I've found this tool extremely useful. It doesn't actually change any settings, just lets you plug in a CPU clock speed, CPU multiplier, RAM divider and shows you the corresponding result.

Ignore the fact the following link is in a german. Just click on the download icon:

http://www.forumdeluxx.de/forum/showthread.php?t=82491

[taqies]

Perhaps you should increment it by 1 MHz and use memtest to check for errors before it fully boots to windows.

[Dark Horse]

Follow the steps in this guide, it will make your life a lot easier:

http://www.dfi-street.com/forum/showthread.php?t=20823

Just randomly plugging in numbers and voltages really isn't a good way to start as you need to build up a pattern of how your chip responds to overclocking so you can know what has made you reach your limit.