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which is the best core for an AMD processor and why? also is there anything special on about any of these core if so please tell im lookin into buying a amd athlon 4000+ san diego core but im unsure of which core to get because i have no knowledge on them so can you guys pls help me out!
clawhammer,san diego,denmark,manchester,toledo,venice,venus

The major difference(s) between the cores you have listed are the amount of L2 cache, single vs dual core, & integrated memory controller. And cores are constantly being improved & revised during their production lifetime....the revisions are called "steppings". I believe the latest stepping of the San Diego core is E6.
If you want a San Diego core CPU, go for the 3700+ & save yourself close to $100...you'll never notice the 200MHz difference. You can always overclock to 2.4GHz (or higher). If you have a look at newegg.com, you'll see that there's two 3700+ San Diegos being offered, the ADA3700BNBOX ($210) & the ADA3700CFBOX ($216). The BNBOX has the E4 stepping, while the CFBOX has the E6 stepping.
http://www.amdcompare.com/us-en/desktop/Default.aspx
http://www.rose-hulman.edu/~freemawa/featured/cpu/amdcores.php

Yep...get the 3700+ San Diego. I have one and it overclocks very, very well. I got mine up to 2.6 fairly easily. I assume it can even get higher than that with better RAM and cooling.
Lian-Li PC61
ASUS A8N-SLI Deluxe
AMD Athlon 3700+ San Diego @ 2.5 gHz stock cooling
eVGA 7800GT
1GB Corsair DDR
WD Carviar 300gb SATA 3.0gb/s
Samsung 17" 740N Monitor
Dr. Pepper

What is interesting is the San Diego core with E4 stepping is the classic San Diego core. The San Diego core with E6 stepping is based on the Toledo core but the multi-cache is disabled. For some reason it seems like AMD produced a lot more 3700+ E6 stepping San Diego cores then they did the 4000+ E6 stepping San Diego cores.
Go with the San diego core 3700+ and save yourself like the others said 80 bucks. Regardless of which one you get they both max out at 2.8ghz overclocked.
AMD Athlon 64 X2 4600+ OC 2.7ghz
2GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 200gig 7200rpm 16mb cache RAID-0
Gigabyte Nforce 4 SLI

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