Please Help Me Make Sense of My RAM specs?

[Shponglized]

Long story short - I just bought new RAM for my Acer laptop and while it is 4 GB more than my old set, I am not sure if it is exactly faster. From the pictures below, could you guys tell me which set is faster - the older 4 GB set, or the newer 8 GB set? I took these with my phone so I could look at them at work, so I am sorry for the less than great quality.

Is the newer set at 8 clocks better than 7? Why does the newer set have only 3 JEDEC columns as opposed to 4?

I still have one slot left. Could I keep one of the 2GB sticks and have 10 GB total?

Gracias.

1[ATTACH]7978[/ATTACH] 2[ATTACH]7979[/ATTACH] 3[ATTACH]7977[/ATTACH] 4[ATTACH]7976[/ATTACH]

[Psyrus]

If you're using throughput and latency dependent applications, then the CAS/timings matter. If you're playing games or opening a bunch of programs, then it's basically just the amount that matters.

Don't fret about those numbers.

And assuming there are no incompatibilities between the old and new ones, you should be able to pop that old 2GB stick in there and have 10GB.

[Shponglized]

But couldn't the different voltage be a problem? Two are 1.35 and the old third one is 1.5. The timings and CAS latency are also different. How do I know I'm not reducing the performance of my RAM?

[Spec]

Moving to support / hardware

[LITOralis.nMd]

But couldn't the different voltage be a problem? Two are 1.35 and the old third one is 1.5. The timings and CAS latency are also different. How do I know I'm not reducing the performance of my RAM?

That will require actual work to make it stable. Not sure such fine grained adjustments are even available in the Acer BIOS.

before you do that,
use the new 8GB, and only after you've run out of RAM enough times while using applications, that you actually mutter under your breath, "dang, I should have installed the other 2GB", should you even consider dealing with adding the other 2GB.