Hello, been a while since I posted. At any rate I have been chugging along with my Efika board for a while now. Someone just asked me about RAM on Efika and I reviewed the various posts here to get refreshed on the subject. Attempts by some to increase Efika RAM didn't seem to go real well, etc...

I am looking at my 2 Efika RAM chips and I see the following part numbers:
SAMSUNG 643
K4H511638C-UCB3
H5116 CMI297CB(

So I go to Samsung and poke around their info and all I get is that these are 512MB chips.

I only have 128MB so what gives?

They are 512Mb and not 512MB. There are two of them. Which makes 1024Mb. 8 "b"its a "B"yte (1024 Mb/ 8 ) is 128 MB.

And no! Its still not possible to replace them. :)

Geit


[ Edited by geit on 2009/8/6 21:46 ]

I understand now. Thanks


So 256MB possible per CS. Efika using only 1 CS?

Efika?
2 x 512Mb
8M x 4bank x 16bit?
(2*64MB)?
using just CSO?







[ Edited by Rodomoc on 2009/8/6 17:12 ]

i still don't understand, what's the problem with usage of graphics memory of some graphics card... is it so difficult to use some part of gfx memory for normal accesses? it would help a lot, if say, 128 megs of gfx memory would be halved to 64 megs for gfx and 64 megs for normal memory...

bye, MarK.

ps: sorry for a bit OT

No, its not possible to get any additional memory working on the Efika board!

Using the GFX memory as system memory is very slow. It would only be useful as slow ram disk or as cache for gfx data. Second would only make sense when dealing with a 256MB card, as the second 128 MB are currently unused.

Reducing the GFX memory from 128 MB to 64 MB makes no sense, as those memory will reach its limit quite fast and then the system gets slow and more system memory is used.

Regarding more Ram on Efika...

I'm not thinking about Efika board itself. I'm just trying to learn how it could be done on a theoretical basis. I'm just thinking of the 5200B and ram here. (eliminate Efika from the thinking process for a bit)

There seems to be a 4chip limit with 5200B and that they have to be within 5cm of cpu. It also seems that 4 ram chips could be utilized on a single CS -or- 2 ram chips per CS for a total of 4. Is this right?

So (in theory), 4 of the current K4H511638C-UCB3 could run on CS0? And that would total 256MB.

My question still is, what is exact configuration within Efika? Yes 2 chips totalling 128MB. I am assuming using CS0 only.

I see only 512Mb chips in this Samsung ram chip series, so if this series still used, then 256MB = theoretical max possible with 4 chip maximum limit of 5200B. Obviously if 1024Mb chips of different chip series used then 512MB possible. Is this right?