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The most efficient "L2" cache is

1. NO. This is the "old" way of locating L2 (external cache).

2. No. DRAM is just the memory used for RAM Memory, not cache.

3. Correct. Many newer designs of CPUs have the L2 cache in the CPU, taken off the motherboard. It is faster because it runs at the CPU speed!

4. No. EDO RAM is not used for cache memory.

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