Decompressing files is a literal cake walk. There's a limit with decompression on how fast a machine will be, and even though WinRAR is now a properly multithreaded application, it's not going to "hit" all 4 of those cores equally, nor will it even hit them to any significant degree because decompression takes almost nothing to do it - compressing files is where you'll see massive CPU usage in comparison. The quad core you have should give something close to the score you posted - 1558 - plus or minus maybe 100 points either way so you're doing quite well.
It doesn't require a lot of memory to be functional, but unlike previous versions of Windows (XP and older, Vista handles memory a bit differently but nowhere near as efficiently as 7 does) Windows 7 makes actual use of the RAM you have, and the more you can put in a machine, the better Windows 7 will use it. Windows 7 requires less than 512MB for itself - meaning the base operating system components, and actually I've done testing on machines with 512MB of RAM and after a few reboots after the installation is complete, the system will settle itself and use about 240MB, seriously. Use the same physical drive for both actions and you choke it 50% - it can't read and write at the same time, so using two hard drives in the operation literally doubles the performance alone over a single one.
You have three hard drives, use one of them for the storage of the archives, and when you extract do it to one of the other hard drives - this way you can read and write at the same time (read from source, write to target) and your decompression will improve dramatically. Here's a tip that'll improve your decompression speeds considerably: Those components can handle such decompression easily, but the storage devices pulling thousands of small pieces of files and then having to write thousands of them - high random file activity - is going to choke it big time and yes, you can see performance cut in half, literally. The basic rule of thumb (since everything relates as I said before): big large single files will decompress faster than thousands of small ones, it's just how things work, not just the CPU and RAM. I had a Core 2 Duo SP9400 recently (2.4 GHz) with 4GB of DDR3 800 in it and that had a score of ~1300 (both are laptop processors). Just for the record, this old ThinkPad T60 w/Core Duo T2300 1.66 GHz w/1.5GB DDR2 533 gives 727 on that benchmark. Those results are actually something you can use for comparison across machines, not just some random 2GB archive.
Since you're using WinRAR, just do the internal benchmark at Tools - Benchmark and hardware test.
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