How The Memory Cache Works

CPU	L1 Instruction	L1 Data	L2
Athlon 64	64 KB 2-way set associative 64-byte lines 128-bit datapath with L2 128-bit datapath with fetch unit	64 KB 2-way set associative 64-byte lines 128-bit datapath with L2	512 KB or 1 MB 16-way set associative 64-byte lines 128-bit datapath with L1 data 128-bit datapath with L1 instruction
Athlon 64 FX	64 KB per core 2-way set associative 64-byte lines 128-bit datapath with L2 128-bit datapath with fetch unit	64 KB per core 2-way set associative 64-byte lines 128-bit datapath with L2	1 MB per core 16-way set associative 64-byte lines 128-bit datapath with L1 data 128-bit datapath with L1 instruction
Athlon 64 X2	64 KB per core 2-way set associative 64-byte lines 128-bit datapath with L2 128-bit datapath with fetch unit	64 KB per core 2-way set associative 64-byte lines 128-bit datapath with L2	512 KB or 1 MB per core 16-way set associative 64-byte lines 128-bit datapath with L1 data 128-bit datapath with L1 instruction
Sempron (sockets 754 and AM2)	64 KB 2-way set associative 64-byte lines 128-bit datapath with L2 128-bit datapath with fetch unit	64 KB 2-way set associative 64-byte lines 128-bit datapath with L2	128 KB or 256 KB 16-way set associative 64-byte lines 128-bit datapath with L1 data 128-bit datapath with L1 instruction
Opteron	64 KB per core 2-way set associative 128-bit datapath with L2 128-bit datapath with fetch unit	64 KB per core 2-way set associative 64-byte lines 128-bit datapath with L2	1 MB per core 16-way set associative 64-byte lines 128-bit datapath with L1 data 128-bit datapath with L1 instruction
Pentium 4	N/A *	8 KB 4-way set associative 64-byte lines 256-bit datapath with L2	256 KB, 512 MB or 1 MB 8-way set associative 128-byte lines 64-bit datapath with fetch unit 256-bit datapath with L1 data
Pentium D	N/A *	16 KB 4-way set associative 64-byte lines 256-bit datapath with L2	1 MB or 2 MB per core 8-way set associative 128-byte lines 64-bit datapath with fetch unit 256-bit datapath with L1 data
Core 2 Duo	32 KB 64-byte lines 256-bit datapath with fetch unit	32 KB 64-byte lines 256-bit datapath with L2	2 MB or 4 MB 8-way set associative 64-byte lines 256-bit datapath with L1 data
Pentium Dual Core	32 KB 64-byte lines 256-bit datapath with fetch unit	32 KB 64-byte lines 256-bit datapath with L2	1 MB 8-way set associative 64-byte lines 256-bit datapath with L1 data