Help choosing DDR2 800 for my Sony VGN-AR590E

Hello,

I was wondering if I could get some help choosing new memory for my Sony VGN-AR590E notebook.

Here is one of the choices I was looking at:
OCZ 4GB (2 x 2GB) 200-Pin DDR2 SO-DIMM DDR2 800 (PC2 6400) Dual Channel Kit Laptop Memory

Any input? Better choices? I am completely picking the wrong memory?
I'm new at this so any help would be greatly appreciated!!

 

Sorry it didn't let me provide a direct link to what I was looking at, here it is:

newegg.com/Product/Product.aspx?Item=N82E16820227251

 

Your laptop supports a maximum of 4Gb of Pc5300 memory, so that is the stuff you should get.
However, Pc6400 is backwards compatible with Pc5300 memory, so if you buy pc6400 clocked at 800Mhz, it will clock down to Pc5300 speeds of 667Mhz.

This is a much better buy:
Pc5300 with cas latency of 4: $50
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231154

of if you want PC5300 with cas latency of 5 $40:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231135

If you do not want G.Skill, than go for these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145193

The difference in cas latency is basically how long it takes for the memory to be addressed by the system, for continual caching.
The actual difference in real life performance is negligable, so you can buy the cheaper of the two if you desire.

K-TRON

 

The PC2-6400 should be running 667Mhz Cas 4 if it's Cas 5 at 800Mhz, usualy the CAS-latency goes down one snap every 133Mhz that's downclocked. So it's equal to PC2-5300 CAS4 memory!

I'd say, go for the cheapest, with a lifetime warranty! Aslong as it's atleast witihin the specs you need, higher spec memory is no problem as backwardcompatibillity is not a problem.

 

Well I guess I am a little confused. Under my laptop specifications it says that the CPU FSB is 800MHz. I thought that meant I could get memory that had 800Mhz. How am I seeing this wrong?

I guess I am also asking if the difference between 667Mhz and 800Mhz is noticeable.

 

The full FSB isn't the full memory speed. So you have learned wrong
FSB is quad-pumped. And FSB hasn't really nothing to do with what memory you should have as there can be various memory ratios between FSB and memory.
Just check what memory there is originally and not FSB.


No, nothing noticeable between 667Mhz and 800MHz, though if you read what we said, you'd notice that 800Mhz memory will run at 667MHz if 667Mhz is the original speed of the previous memory.

 

So what exactly is the difference between PC2-6400 and PC2-5300??
Sorry about not knowing much!

 

The chipset in your notebook can only recognize memory speeds of up to 667Mhz.
The Pc6400 is 800Mhz memory, but when memory is manufactured it needs to meet JEDEC standards (which means the memory has to clock down to lower speeds for compatibility) Thus PC6400 can downclock (run at a slower speed) to match Pc5300 speeds.

If things are confusing you, just purchase the Pc5300 memory linked to above. They will work with your laptop.

K-TRON

 

So if I can find DDR2 800Mhz PC6400 for cheap, it wouldn't hurt to go with that? Or I would just be wasting my time and money altogether?

 

It wouldn't hurt, only money-wise if it costs more than PC2-5300. Otherwise it works just fine.

 

Alright, thanks for all of your help!

 

No problem dude! We're all here to help each other

 

I know theres sodimm ddr800 that are compatible with 667 and 533
so i can assume KVR800D2S5/1G 1GB 128M x 64-Bit DDR2-800 CL5 200-Pin SODIMM
is also compatible as pc2-4300 533mhz?

cus I have a dell precision m70 (intel 915PM) and im going to refurbish, put 2GB ram and a 320GB WD 7200rpm.
EDIT: ups my drive is IDE.. no WD 320GB for it...