Type of DDR and their common sizes.

 Below are list of ram,their types and sizes.

Before I proceed to list them, let me, first of all, make you understand the works of ram in a computer.

The major work of ram in a computer is for display and also for speed. without ram computer cannot display.

So for a computer to display, there must be a very good working ram in it, and sometimes when you insert lower ram in a higher computer, it may also not display.

Note; the types of ram that am about to list here are for laptop not for desktop,

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I hope you all know that desktop and laptop are not using the same ram? the ram for desktop are bigger in size than that of the laptop.

1.DDR1[R1]: This type of ram Have long vertical 
and horizontal I.C [integreted circuit] attach to it on the surface with one opening[one channel] almost at its edge, just like in the photo below.

Sizes: 1GB, 2GB, 4GB, 512MB, ETC

2. DDR2[R2]: This type are similar to R1, the major difference is the I.C attach to them. the IC for R2 are shorter than that of R1, with one opening almost at the edge also, like you can see in the pics below;

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Sizes: 1GB, 2GB, 4GB, 512MB, ETC.

3.DDR3[R3]; this type of DDR is different from the other two mentioned above. it has it own one opening [One channel] almost at the middle and a shorter IC like that of DDR2, see photos below.

Sizes: 1GB, 2GB, 4GB, , ETC

4. DDR4[R4]; this type of Ram are similar to that of R3, it also has shorter IC with one opening[one channel], you can find this type in some of this modern pc, not yet that popular in the market.

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on this one you can find single 8GB

5. SDRAM[SD], this type of Ram is totally different from that of R1, R2, R3, and R4. SDRAM has two opening[double Channel], but possess the same IC as that of R2 and R3, see the photo below.

Sizes: it has only 512mb, or below’


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