K8N Neo-FSR nForce3 - Corsair XMS memory running at wrong speed

I have a mobo mentioned in the title. The problem is with upgrading the memory - I've recently bought a 1GB memory stick to go with the 2 existing 512kb memory sticks to make up a total of 2GB, the maximum allowed by this mobo.
The problem is if I have all 3 sticks installed i.e. 2GB the memory will only run at 166mhz/DDR333. If I have just the 1GB stick installed it runs at 200mhz/DDR400. If I have the 2 x 512mb sticks installed it runs at 200mhz/DDR400. If I have have the 1GB and 1x512mb stick, either one, in either socket, it runs at 200mhz/DDR400. BUT if I have all 3 sticks installed it only runs at 166mhz/DDR333. 
Does anyone know whats going wrong and how to fix it?  ??? The memory sticks are all Corsair XMS 3200C2PT 400mhz sticks. The bios version I'm not sure of, I updated the Bios after I built the PC a year and a half ago but I havn't done it since I'm worried about something going wrong (bad flash = dead PC) etc. The stick timings are all 2-3-3-6 I've tried it with the "auto" setting in the Bios and setting the timings manually but the result is the same.

Quote from: Stick on 08-March-06, 17:08:07
you might try different timings on the memory, something like 3-4-4-8. there is technically one way to pass this issue and that is by overclocking. you can OC your CPU till the memory will run at 200mhz (i think FSB should be 240 in this case if i'm not mistaken)
I'm not very up on o/c'ing.. in fact I know next to nothing about it. How would I do that without damaging anything?
Quote from: Apple renegade on 08-March-06, 18:05:33
Not sure about the nForce S754, but the via ones had no way to run on DDR400 using 3 sticks.
Doesn;t it say in the manual ?
It does so here:
http://www.msi.com.tw/program/products/mainboard/mbd/pro_mbd_detail.php?UID=571
Sorry, where? I can't see any mention of it. According to the manual and on the website it ought to be compatible:

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    Quote
    Originally posted by egg1981
    Hello all,
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    Quote from: syar2003 on 22-February-06, 05:10:37
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  • MOVED: k8n neo fsr overclocking results

    This topic has been moved to Overclockers & Modding Corner.
    k8n neo fsr overclocking results

    well i dont know much but im pretty sure u should set memory timing to 1t

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    Quote from: syar2003 on 27-August-06, 20:29:14
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    Quote from: syar2003 on 27-August-06, 20:29:14
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