Upgrading RAM

Hi guys,

I'm looking to speed up a friends computer by upgrading the RAM of their Acer sa90-yb7z. The internet has not been as helpful as I thought, so I thought i'd check with people who know what they're doing before I start jamming any old spare RAM I have lying around into the motherboard.

Would 2 x PC2 5400 (OCZ667) 5-5-5 @ 1.8V 1Gb be a reasonable and compatible upgrade in the Acer F671CR R01-B3S1 motherboard in this PC, compared to the stick below?
Type DDR2
Size 512 MBytes
Manufacturer Nanya Technology
Max Bandwidth PC2-5300 (333 MHz)
Part Number NT512T64U88A1BY-3C
Serial Number D54D2614

Thanks,

Wowdude

Is they only running 512Megs?

Yes you'll see a bit of an increase in speed going with 667 vs 533, and upping the RAM to 2 Gigs

Thanks Patonb! Would these sticks be compatible?
And the RAM was constantly on 78% usage, so at least this'll give the computer more room to breath. I may also try some tweaks just to speed the system up as it's boot and desktop loading time is appalling.

Welcome
In addition to the excellent advice you already received, I suggest that you also, try this site to determine compatible ram
RAM Memory Upgrade: Dell, Mac, Apple, HP, Compaq. USB drives, SSD at Crucial.com
They will indicate exactly what is needed.

If you already have the RAM, I'd say try it and see, but as OCZ no longer makes/sells RAM go with a different brand.
Crucial as linked by Rich or Corsair

Each brands site will have a compatibility checker