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AMD Athlon II X2 Cache-Memory

Taking into account that the only principal innovation in Athlon II X2 processor dies is the modified cache-memory subsystem, we decided to dwell on it a little more. As we have learned before, in our first Phenom II CPU review, AMD engineers didn’t make any changes to the cache working algorithms when they introduced new 45nm process. As a result, cache-memory of Phenom II processors on Deneb core works at exactly the same speed as the cache-memory of first-generation Phenom CPUs. However, Regor core may have some surprises hidden up its sleeve, because its L2 cache is twice as big.


Phenom II X2 (Callisto)


Athlon II X2 (Regor) 

However, despite this fact, the associativity of its L2 cache remained the same: Athlon II X2, just like Phenom II X2, uses L2 cache memory with 16-way associativity. This allows us to anticipate equal performance from the L2 cache of the new Athlon II X2 and Phenom II X2 processors. The advantage of having a larger L2 cache in Athlon II X2 will imply that the data is more likely to be in it.

This is what it looks like in reality:


Phenom II X2 545 (3.0 GHz). 
Note that Everest doesn't recognize the CPU codename correctly!


Athlon II X2 250 (3.0 GHz) 

As we have expected, during the actual tests, we saw almost the same L2 cache performance numbers by Deneb based CPUs and those on the new Regor core. Athlon II X2 memory subsystem turned out a little faster, which is perfectly logical considering that it didn’t have to spend extra resources on searching L3 cache memory for the requested data.

 
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