1-3% is a lie. Dual channel is noticeably much faster in everything. Doubles your bandwidth. Every system I have reorganized into proper dual channel RAM so far has gotten noticeably faster as a result. That's right, even in web browsing. In intensive games it'd be a big difference.
Synthetic benchmarks really won't show the difference that much especially with IMCs being long-improved now; sadly you will have to experience it to know it, and the guy with 28 years experience [dixson01974] is right. Computers with dual channel "feel" noticeably much faster to use in my experience. Even my mom notices it; after months of complaining of slowing performance on her laptop, I did a secret swap from a 1x2GB SODIMM to 2x1GB SODIMMs and she hasn't complained since.
Being 1333 CL9 requiring a massive and unacceptable 1.65V for the generic timings, I wouldn't keep that RAM no matter what anyway. I say you return the kit immediately. Buy this kit of 2x2GB DDR3-1600
, or similar for a similar price. At $45/30 AR (up to 2 rebates per person per order), not only will you get ideal dual channel performance but the slight benefit of 1600Mhz operation.Edited by xd_1771 - 4/6/11 at 4:53pm