Next, we ran the test systems through Futuremark’s latest system performance metric built especially for Windows Vista, PCMark Vantage. This benchmark suite runs through a host of different usage scenarios to simulate different types of workloads including High Definition TV and movie playback and manipulation, gaming, image editing and manipulation, music compression, communications, and productivity. We like the fact that most of the tests are multi-threaded as well, in order to exploit the additional resources offered by quad-core processors. We used the 64-bit version of the benchmark and defragmented the hard drive immediately prior to running it. The test was looped 3x. One thing to keep in mind when comparing PCMark Vantage results is that the benchmark's margin of error is fairly wide—we'd estimate 5-7 percent. Relevant factors include whether or not the hard drive was defragmented immediately prior to the run and whether Vantage was run immediately following OS+driver installation, or only after a full suite of tests and other benchmarks had been run.
In order to generate the cleanest results possible, we tested Vantage immediately after OS installation and defragmented the hard drive immediately prior to benchmarking.
Vantage might be multi-core friendly, but it's a big fan of HDD performance and clockspeed / IPC as well. The i5-750's high performance and the meaning behind the (OEM) and (Retail) qualifiers is explained in more detail here.