Slightly/Signifigantly different timings?

[skreenname]

I was wondering if slightly/Signifigantly different timings can cause RAM to be less efficient.
I know that Identical timings are best, but last I checked the RAM I was intent on getting was out of stock.
I said Signifigant because all the timings on the GSKILL are lower.

I have 2GB A-Data DDR2 800 RAM, 5-5-5-18
And was looking at getting This GSKILL or SuperTalent RAM.

The GSKILL has all around lower timings.
The Supertalent has a slightly faster ( Lower is faster, if I'm right. ) tRAS timing.

I don't know that much about RAM, but I have skimmed the Sticky.

Also, I'm sure someone is going to question why I /need/ 6GB of RAM, And honestly, I don't.
But I'd like to be able to keep the same RAM for as long as I can and It would be nice to have a really high ceiling.

 

[GhislainG]

The Super-Talent is slower than the G.Skill and it requires more voltage. The G.Skill will run at 1.8V and 5-5-5-18 timings to match the A-Data. If you can, sell the A-Data and get 4 G.Skill modules. Then run them at their rated timings of 4-4-4-12.