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Austrian site Geizhals.at show that the cheapest one will cost 65.63. And for this money you will get a Sempron 64 2800+ clocked at 1.6 GHz and powered with 128kb cache memory.
AMD also offers Sempron 3000+, the same clock CPU, with 256KB cache memory for 75.77. Also listed are 3200+, 3400+, 3500 and 3600+ socket AM2 CPUs.
The fastest Sempron is clocked at 2000MHz has 256KB cache memory and it is of course a 64-bit CPU, supports Cool'n'Quiet, NX Flag, SSE 3 and its maxima thermal dissipation should be around 35W.
All Semprons 128KB and 256KB ones are based on Manila Core, F-Stepping and costs 121.19. The site says chips will be available in June but it will gladly take your money for pre-order.
The cheapest Athlon 64 socket AM2 is 3500+ clocked at 2.2GHz and supported by 512KB cache memory is listed for 205.01. It is based on Orleans core, F-Stepping core supports AMD 64, Cool'n'Quiet, NX Flag, SSE 3 and its maxima thermal dissipation should be around 65W. It supports AMD Pacifica visualisation marchitecture. AMD also offers AM2 3800+ clocked at 2.4GHZ with the same spec and 286.82 price.
The rest of the CPUs are more expensive and dual-core. The cheapest is AMD Athlon 64 X2 3800+ Sockel-AM2 boxed, 2x 2.00GHz, 2x 512kB Cache based on Brisbane core, F stepping and is set to cost 299.94. Its maximal thermal dissipation should be around 89W while it also supports AMD 64, Cool'n'Quiet, NX Flag, SSE 3 and Pacifica marchitecture.
AMD also offers 4000+ clocked at 2GHZ with 2x 1MB cache and will sell it for 324.18, 4200+2.2GHZ x 2 with 2 x 512KB cache for 360.54, 4400+ with 2.2GHZ x 2 and 2 x 1024KB cache for 464.55, 4800+ with 2x 2.4GHz and 2x 1024KB cache for 638.49 and the milestone 5000+ with 2x2.6GHZ cores, each powered with 512KB cache for 688.75, all based on Brisbane core.
Last up, the flagship Athlon 64 FX 62 is based on Windsor core, F-stepping and supports AMD64, Cool'n'Quiet, NX-Flag, SSE3, Pacifica and it is dual-core, of course. It is clocked to 2.8GHz x2 and each core has 1024KB cache memory. It is listed for saucy 1223.48.
You can check it and preorder this stuff here. µ