Neo2: New bios, new CPU and new problems. Any ideas???

I wonder if any brainboxes here have any ideas what's going on here.
Recently I bought an Opteron 146 off ebay, as an upgrade to my existing A64 3200+. I have been running the 3200+ at 10x250 for about 1 year now with no crashes or problems whatsoever, but the idea of 1MB cache and maybe 2800MHz or more was too tempting to resist, so I went for the new Opteron.
I upgraded to Easybios 1.c3 to make sure the new CPU was properly supported.
But since installing the Opteron, I have had lots of problems. The CPU will boot and run at up to 2900MHz with an extra 10% voltage. But it is not Prime stable at that speed. At 2800MHz + 1.54v it will run 3dmark and SuperPI and things like that, but it just won't run Prime.
So I have tried to see at what speed it *will* Prime. I have dropped the FSB down and down and down and down.
Today I find it won't even run Prime at the stock 2,000MHz!!! Not even at 1.54v, let alone 1.4v stock.
So what's goiing on? Have I been sold a "duff" chip? Or maybe Easybios 1.c3 doesn't like my PQI Turbo TCCD ram? (That would seem strange. I ran a few loops of Memtest86 with my old CPU just after I upgraded the bios and all seemed fine up to 295MHz, which is as high as I ever went before.) Or maybe I have some other fault that's been hidden all along?
What do you guys suggest I do? I could flash back to an older bios version. Or I could swap the CPU out and put the old one back and do some more tests (BIG hassle as I will have to take the motherboard out again to do that!)
Any ideas / suggestions?
Cheers
Chip

I tried lower the memory speed (133 divider) and it made no difference. I even tried dropping the multiplier down to 8x and ran 8x200 = 1600MHz, with a 133 memory bus (i.e. 1064MHz on the memory). Even at these abismal speeds, it would not pass Prime for more than a few minutes. I tried 1.4v all the way up to 1.55v and it still wasn't stable even at those speeds.
Anyway, after lots of messing around, I found the CPU has a problem with the particular version of Prime95 I was using. I downloaded the latest version and I can at least get it stable running now - albeit at pathetic speeds.
I can get 2300MHz stable at 1.5v. Pretty abismal for an Opteron 146. The crook who sold it me swore it would do 2800MHz at 1.5v stable - in a Neo2!!! I think he lied.
I will see how high I can get it at 1.55v, but I don't hold out any great hope - its not only P95 that wasn't stable before - it would crash windows occassionally anyway, so it clearly not a great chip.
Thanks to everyone. If anyone has got any bright ideas as to how to squeeze any more performance out of this piece of junk, I would be keen to hear it.
This chip cost me £140 on ebay, and I won't be able to sell it for much because I - unlike the person who sold it me - am not prepared to lie about its performance.
Since my old A64 would do around 2650MHz with a worse cooler than what I have now, I think my latest "upgrade" has been a downgrade :-(
Chip.

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