^ first, Your scores are also slightly low. Cause, Most likely because you are using the msahci driver. For Intel chipset Should be using the iaSTor driver (Intel RST driver ver 10.6, they have a newer on 10.8). My Laptop w/128 Gig M4 overall score is over 700 w/as ssd.
Also, comparing the m4 to a low end sata II SSD is not valid.
To OP, as clutchc indicated your Seq read is very close to spec, seq writes are slightly low. BUT spec was not with AS SSD, was with a benchmark program that uses Data that is readily compressable, AS SSD uses compressed data. Could not find any Benchmark for the 4 K with is the important matrix. Higher benchmarks are with Intel chipset using Intel ahci driver.
Sorry to be the bear of bad news, but Personnally I would have skiped on that SSD
Ref:
http://www.newegg.com/Product/Product.aspx?Item=20-139-415&SortField=0&SummaryType=0&Pagesize=10&PurchaseMark=&SelectedRating=-1&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=true&Keywords=%28keywords%29&Page=1
This indicates ony a 2 -> 4 x HDD performance. Only one benchmark for Other than Seq, and I was not impressed with the resutls (slightly higher than yours, but was run with crystal Diskmark. The High Failure rate leading to very poor 1/2 egg recommendations Is related to the Older Firmware that bricked a lot of them.
A while back, I had read that some of the Kignston "value" SSD had rather poor 4k specs, and were only 2->4 x a HDDs. Also Note that you are on an AMD system, using MS default msahci driver.
Bottom line: If it was cheap, and YOUR performance (In Using) is considerably better than a HDD then Ignore the benchmarks and ENJOY. Down stream whan you can afford a Higher end one, get it and use the Kingston as a "scratch" drive.