F3-12800CL7-2GBECO x2 Timings can't meet specs?

[rymcbc]

Just trying to figure out why I cannot get my Ram timing as per spec ... currently the best I can get is..

8-8-8-21

Specs are 7-8-7-24

So I guess my question is am I even gonna notice the difference or is there performance to be gained. Never played with Ram timing before.

CPU -Phenom II x4 965 Blk Ed 3.4ghz RB-C3 Rev (Water cooled with Cossair H50 Pro)
MB -Gigabyte GA-MA790XT-UD4p
RAM -2X Gskill F3-12800CL7-2GBECO (4GB total)
Graphics -2x Gigabytge ATI 5850 1GB in Cross-Fire
PSU -Cooler Master 950W

CPU Temps under load 48 C
Case Temps under load 55 C

Current Bios Settings

CPU ratio - x20 4ghz
NB auto - 2600mhz
HT auto - 2600mhz
CPU freq - 200
Mem clk - x8.00 - 1600mhz

Volts are

DRAM - Norm
NB - 1.4
SB - 1.4
NBVid - 1.3
CPU - 1.5

Any help or ideas would be greatly appreciated.

[GSKILL TECH]

No, you will not notice a difference. You can not operate CL7 due to a BIOS limitation.

Thank you
GSKILL TECH