# Number of transistors on a 512mb mem card

HXP 01:47 08 May 07
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My son asked me how a memory card worked and I started the explanation about - on off switches & binary numbers - and was going quite well until he quite rightly asked me so how many 'switches' does a 512 mb card have.

I searched the web and can't really see an answer

Assuming a transistor for each 'bit' it would be an astronomical number.

512mb
1 megabyte = 8,388,608 bits
512 x 8,388,608
= number of switches ?

I am starting to think I got it wrong

Anyone out there know .....

LAP 10:00 08 May 07

De Marcus™ 20:33 08 May 07

the impression that transistor numbers correlated with the manufacturing process. For example, a chip (cpu/gpu) produced using a 65nm (nanometre) process would have x number of transistors whereas one produced using a 90nm process would obviously have more.

I don’t think it’s a simple maths equation either, in fact I don’t think you can work out the transistor numbers based on the memory of a card, I’m almost certain (don’t hold me to this ? that transistor figures are derived from the above mentioned process.

I can tell you that the latest graphics cards have well in excess of 600,000 transistors (closer to 700,000 for 8800gtx cards) click here (read the whole page).

Stuartli 18:35 09 May 07

The increasing number of transistors used in Intel CPUs from 1972 onwards might prove interesting:

hzhzhzhz 08:30 10 May 07