[Solved] What does "DDR3 1066 (PC3 8500)" mean ?

Hey guys, I don't really know much about RAM, except that there's 3 types right now(DDR,DDR2,DDR3)
I was wondering what the numbers on this page under "Speed" meant ?

http://www.newegg.com/Store/SubCat [...] op-Memory#

EX.
DDR3 1066 (PC3 8500)

Specifically the "1066" and the "PC3 8500"

1066 and PC3 8500 are the same number in fact, just different standards. One is the actual described speed and PC3 xxxx is the module name

1066 represents a speed of 1066MHz.

I see, I see.
Thank you guys for replying.


Why is the DDR3 1333 listed 3 times ?
DDR3 1333 (PC3 10600)
DDR3 1333 (PC3 10660)
DDR3 1333 (PC3 10666)

Alright, I think I get you.

One more question.

Say I was picking out a motherboard, and it called for DDR3 1333 RAM,
what would be the difference in performance out of those 3 JEDEC varients ?

I don't know what either of those are ?

Although, I can answer those questions:

A - Pretend it's this one http://www.newegg.com/Product/Prod [...] 6813131621
A - $700 or less
A - Windows 7/64-bit
A - 8gb of RAM

PC3-8500/8 => is 1066 MHz; 1066/2 = 533 as reported with CPU-Z; ANY SPD/JEDEC reported on CPU-Z is 'HALF' it's operational Frequency. In other words CPU-Z reports "I/O bus clock" NOT "Data rate" -> http://en.wikipedia.org/wiki/DDR3_ [...] rd_modules

I 'wish' CPU-Z 'did report' Data Rate it sure would calm people down!

Trying to provide Certified/Tested RAM on a 'pretend' MOBO is pointless. However, the $700 Total Budget will really hamper your choices in RAM. I would use 'Value' RAM, 4GB {2X2GB} and get 1333 MHz DDR3 with either CAS 8 {8-8-8} if possible or CAS 9 {9-9-9}. Once you decide on a MOBO simply enter the information on the RAM Mfg's site 'Configurator' or use the MOBO's QVL list as listed on it's website.

The ASUS P7P55D-E Pro is an excellent MOBO, but it's too much for a $700 build.

Example - RAM ASUS P7P55D-E Pro:
QVL {see Memory Support List} - http://usa.asus.com/product.aspx?P [...] templete=2
Tested Corsair - http://www2.corsair.com/configurat [...] id=1330436
$45 Example -> http://www.newegg.com/Product/Prod [...] 6820145278
$99 Example -> http://www.newegg.com/Product/Prod [...] 6820233144

Keep in mind the RAM speed and performance is a primary function of the Quality of the IC, Frequency & CAS only give you a 'ballpark' idea. Ideally, you want high frequency with low-tight CAS. Meaning there are plenty of 1333 MHz RAM that can outperform 'cheaper/IC' 1600 MHz RAM. Only benchmarking with several 'Testing' Apps will show true and/or potential performance.

I would strongly recommend that you put together a Spread Sheet with Components & Costs before ordering anything. If you don't have Excel -> Free Open Office http://www.openoffice.org/

Great Building Guide {tecmo34} http://www.tomshardware.com/forum/ [...] ilds-usage

Again, use my friend's guide -> http://www.tomshardware.com/forum/ [...] ilds-usage and also here's his Building Guide -> http://www.computing.net/howtos/sh [...] c/509.html

From my Example above, they are ALL compatible Sets for the ASUS P7P55D-E Pro - I used the "Tested Corsair" and cross-referenced them from Newegg. My links all work but your copy/pasted doesn't {cut the middle of links out}. If you choose a different MOBO then go to Corsair.com and use the Find Compatible Products -> http://www.corsair.com/learn_n_explore/

DDR3 1333 (PC3 10600)
DDR3 1333 (PC3 10660)
DDR3 1333 (PC3 10666)

Means nothing about 'performance' it means revisions of JEDEC and (PC3 10666) is the latest standard for 1333 MHz DDR3. Again, 2 different sticks of 10666 will perform diffidently; {unseen IC's}, CAS Timings, Cooling, etc. The IC or performance is somewhat tied to the prices but the 'true measure' is to Google Benchmarks +RAM Model Number. Further, at some point the higher costs don't make sense in most builds whereas the 'extra' savings should be used for improved: CPU, GPU, SSD, etc.

For other RAM simply go to the RAM Mfg's site and select your MOBO from their configuration online tools:
G.SKILL -> http://gskill.com/configurator.php
Kingston -> http://www.kingston.com/
etc...

You'd have to research backwards to find out what RAM is of what JEDEC type and/or QVL or Tested. My best guess is that 10600 and 10666 is on the list, there are fewer 10660 but I assume if you researched them all chances are there's some of each...

Again, use either method I recommended {QVL or Tested}, Matched Sets and if adding 4 sticks Duplicate Matched or 'Quad' Sets.

Yes, buy in sets of 2 or 4 'sticks'.

Best answer selected by ostrich2.