I updated the new drive and I've checked to make sure that my Windows 7 settings are ideal for SSDs (regarding write back, large file cache, system restore, etc.) as well as TRIM enabled and AHCI mode enabled. The old drive continues to score around 480-490, while just a week or two ago it was scoring 790. The new drive is blazing, consistently scoring 770+.
The one thing I haven't done is try to defrag the old drive. Should I do that? Could it help?
I've literally tried swapping ports, swapping cables, trying different SATA power cables... everything hardware related that I could think of. Like I said, I've confirmed that my settings are ideal.
I'm hoping that this is all because of running back-to-back benches, as Rebelord pointed out. However, I didn't bench my C: immediately before installing the new SSD (P... I benched it within the past 10 days, though. So, I'm seriously hoping that if I give it a week it will come back up to 700+ total score.
We'll see. Anyone else have other thoughts?
PS: My drives are not in a RAID. I thought about setting up RAID for them, but decided against it as I didn't feel like going through the trouble of doing a work-around or reinstalling Windows. Also, you lose TRIM when you RAID SSDs and I'm not convinced that the real world performance gains will be worth it.