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Recommended Book
High Performance Memories: New Architecture DRAMs and SRAMs - Evolution and Function
By Betty Prince
Wiley
Price: $158.80

Home » Memory
DDR2 Memory Tutorial
Author: Gabriel Torres
Type: Tutorials Last Updated: July 19, 2005
Page: 2 of 4
$ Check REAL-TIME pricing for Crucial Technology Ballistix 2 GB DDR2 RAM (BL2KIT12864AL1065) $
Crucial Technology: $73.99 Dell: $99.99
Office Depot: $83.95 ZipZoomfly.com: $88.90
Egoodz: $75.99 Newegg: $23.99

Physical Aspect

DDR and DDR2 modules have the same physical size, but DDR modules have 184 contacts, while DDR2 modules have 240. On Figure 1 you can compare the difference between DDR2 and DDR edge contacts.

DDR2 Memory Tutorial
click to enlarge
Figure 1: Differences on edge contact between DDR and DDR2 modules.

Thus there is no way to install a DDR2 module on a DDR socket and vice-versa.

All DDR2 chips use BGA (Ball Grid Array) packaging, while DDR chips almost always use TSOP (Thin Small-Outline Package) packaging. There are DDR chips with BGA packaging on the market (like the ones from Kingmax), but they are not so common. On Figure 2 you can see how a TSOP chip on a DDR module looks like while on Figure 3 you can see how a BGA chip on a DDR2 looks like.

DDR2 Memory Tutorial
click to enlarge
Figure 2: DDR chips almost always use TSOP packaging.

DDR2 Memory Tutorial
click to enlarge
Figure 3: DDR2 chips use BGA packaging.

Pages (4): « 1 [2] 3 4 »
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