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CPU Roundup April 2010

CPU Roundup April 2010

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The Processors

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All four AMD processors being tested today support socket AM3 and are also backward compatible with AM2+ hardware. They are therefore all DDR3 compatible (DDR2 with AM2+), support HyperTransport 3.0 and are manufactured using a 45nm process.

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The Athlon II X2 255 is a low cost model, sporting two cores running at 3.10GHz. It is almost identical to the X2 250, differing only in clock speed – 3.10GHz rather than 3.00GHz. It has a bus speed of 200MHz with a 15.5x multiplier and a 2000MHz HT link. For each core there is 64KB of both level 1 instruction and data cache with 1 megabyte of L2 cache. The TDP of the X2 255 is 65W.

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The Athlon II X3 440 is quite similar in terms of specs to the X2 255 but features an extra core. It also runs with a bus speed of 200MHz and a 2000MHz HT link but uses a 15.0 x multiplier. So it runs with a slightly lower core clock speed of 3.0 GHz. There is 64KB of both level 1 instruction and data cache per core and 512KB of L2 cache. The TDP of the X3 440 is 95W.

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The Athlon II X4 635 is the most powerful Athlon CPU on test today. It has four cores running at 2.9GHz and runs with a bus speed of 200MHz and a 2000MHz HT link, using a 14.5 x multiplier. Similarly to the X3 440, the X4 645 features 64KB of both level 1 instruction and data cache and 512KB of L2 cache per core. It also has a TDP of 95W.

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The final processor on test is the Phenom II X2 555 which has the fastest core clock speed of the four processors at 3.2GHz. Like the Athlon CPUs, it runs with a bus speed of 200MHz and a 2000MHz HT link and uses a 16.0 x multiplier. It has twice the L1 data and instruction cache of the Athlon CPUs at 128KB per core, features 512KB of L2 cache and has 6mb of L3 cache per core. The Phenom II X2 555 has a TDP of 80W.

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Stuart Davidson

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