K8N Neo2 Platinum - Best CPU upgrade for under £200 please?

Hi there,
I currently have an AMD Athlon 64 3500+ 2.2ghz running on this board. The BIOS is the latest etc. I am now wanting to upgrade the CPU on this. I run everything at normal settings... don't overclock etc.
Not sure what I can go to with it and was wondering if anyone can advise please?
Budget for CPU upgrade is £200... any help would be very much appreciated.
Thanks in advance,
Gazza.
PS: Not sure if other specs are required but here goes:
2 X 512MB PC3200 184 pin DDR400 (was thinking of just buying another 2 x 512MB)
2 x 80GB Segate SATA HDD 8MB CACHE (was thinking of buying a Seagate Barracuda 320GB SATA HDD 16MB CACHE)
256MB Radeon X800XT Platimun AGP Graphics Card (keeping this)

Quote from: WaltC on 27-December-06, 10:36:15
Check out this very brief thread of mine:
http://80.190.215.245/index.php?topic=103825.0
...If your 3500 is a 90nm San Diego core, there's really nothing new for you there.
If it's an earlier core, though, you might have difficulty in supporting all four 512mb DIMMs at 200/400MHz.  The San Diego 3700+ core I just bought to replace my 130 nm A64 4000+ has the same 1mb L2 cache as the A4000+ it replaced, but an improved memory controller which will support 4 double-sided 512mb DIMMs in this motherboard at full speed of 400MHz DDR.  The 3700+ is 90nm, and is simply generally a better core in terms of errata, power consumption, and, if you ever feel the need to experiment, overclocking.  I would imagine you should be able to pick one up at < 200 pounds, your cost (my keyboard doesn't have a "pound" key...)
My last post in the thread mentions what bios version you should run with this cpu.
Also, unlike the Newcastle or Winchester A3500+ cores, the A3700+ San Diego 90nm core supports SSE3 intructions.  Here's an article you might care to read describing some differences between the A3500+ Newcastle and Winchester cores:
http://www.hothardware.com/viewarticle.aspx?articleid=613&cid=1
Here's a current link to the 3700+ cpu for sale:
http://www.newegg.com/Product/ProductList.asp?DEPA=0&type=&Description=A64+3700%2B+Retail&Submit=ENE&N=0&Ntk=all&Go.x=0&Go.y=0
Many thanks for your reply, much appreciated. However a lot of that has just gone right over my head I'm afraid :(
Do I have to strip the PC to find out which processor I have? The invoice I still have for the PC does not state what type it was. This was not a home built PC and was purchased from an online store in the UK.
I have a list from the MSI site of processors that this MB is supposed to take. Am I right in saying that I could install an AMD Athlon 64 X2 4600+ Skt939 2.4Ghz 512KB Processor?
Once again many thanks for your help.
Gazza.

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