Bought a socket 478 3.4GHz Intel SL7CH from ebay and the CPUID V1.53 program says that there is no L3 cache. I was expecting 2MB. Should I put the 3.2GHz with 1MB of L2 cache back in or leave the faster one with only 512KB of L2 cache in?
The L3 cache should show up in CPU-Z unless the CPU is defective or the BIOS is somehow set to disable the L3 cache. I have the Xeon version of the 3.2 Gallatin (SL7AE) and the 2 MB of L3 cache showed up immediately after I installed the CPUs in my board. I'd check the BIOS first and then suspect the CPU. I wouldn't be terribly surprised if the CPU is a dud since it is an Extreme Edition CPU bought off eBay and may be counterfeit/misrepresented (such as a normal 3.4 GHz P4C being sold as a 3.4 EE) or has been abused by some overclocker in the past.