Michael, It seems the max memory is 4GB for that system - 4 banks of 1 GB sticks. RAM memory Capacity - 4 GB Memory Type - DDR2 SDRAM - DIMM 240-pin Data Integrity Check - Non-ECC Speed - 667 MHz ( PC2-5300 ) Features - Dual rank , unbuffered You already have 2 1GB sticks in the machines - what speed are they? You should match the speed for all four sticks. The second set you mentioned are only 533 MHz, whereas your bus is 667 MHz. If your system is slow, get the fastest memory you can afford. Mark On Wed, Oct 8, 2014 at 1:51 PM, Carruth, Rusty wrote: > Yes, 1024 is one gig, but often some memory is stolen by the motherboard – > for example if you have an on-board graphics card that uses main memory for > its RAM. > > > > Personally, if you can afford it and the 4G is less than 2x the 2G I’d get > 4G – but if you could find 2x2G sticks then you could have 6G total – not > bad IMHO. > > > > > > *From:* plug-discuss-bounces@lists.phxlinux.org [mailto: > plug-discuss-bounces@lists.phxlinux.org] *On Behalf Of *Michael Havens > *Sent:* Wednesday, October 08, 2014 1:43 PM > *To:* PLUG > *Subject:* memory > > > > I know this is a stupid question but... > > > > I got a Dell dimension c521. It is slow so I figure I should add memory. > There are 4 memory slots with 2 being used. How much memory is that? Well, > the cards that are in there say it they are two cards with 1024 mb apiece. > 'free -h' reports > > > > free -h > > total used free shared > buffers cached > > Mem: 1.9G 1.4G 489M 18M 59M 535M > > > > isn't 1024 one gig? Where is the rest? > > > > SHould I buy this? > > > *NEW 4GB 4x1GB DDR2 PC2-5300 667MHz RAM Memory for Dell Dimension C521* > > > > > or should I get this? > > > *2GB (2x1GB) RAM Memory CMS Compatible with Dell Dimension C521 Desktop* > > > :-)~MIKE~(-: > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss >