Precision M6400 Owner's Lounge *Part 2*

The chips on the Kingston HyperX has the following printed on it:

SK hynix
H5TC4G838FA
RDA 546V
DWMAK909SH or DWMAL031H1 (There's a few different markings for this on the chips)

The chips on the Crucial, on the other hand, has a big print BX across it and V10X or V105 on one top corner. Nothing more.

I can upload the pictures I took of them if you want. However, you will find the same info as above.

 

Maybe H5TC4G83BFA?
Thanks. Now let me clarify the issue. 8GB modules use sixteen 4Gbit RAM chips that use address lines from A0 up to A15. The A15 pin is not just an address pin. It is responsible for initialization commands during boot up as well. When you inserted your RAM, M6400 couldn't initialize it because A15 is a part of the MR1 register and is not connected in M6400



The difference between the SO-DIMM interfaces of M6400 and M6500 is that the A15 pin is not connected in the first case, whereas it is connected to the CPU socket in M6500.
Now, here is a table of addressing for 4Gbit chips.

As you can see, there are 3 types of RAM chips with x4, x8 and x16 bit data interfaces. A typical RAM use 8bit chips. Yours are 8bit as well (as they are 16 in total). According to the table, they use the A15 pin. But there are x16 chips (the last column) which don't use A15 and the last pin used is A14 which would be a good option for us. But now it comes down to the memory controller itself.
According to the datasheet:

The memory controller has 2 channels that support up to two RAM sticks each. A DDR3 module has a 64-bit interface. If we use 16-bit chips to build up a rank, we would need 4 chips to build up a 64-bit rank. But we can use up to 2 ranks for each RAM stick, thus it will have 8x16-bit chips (4 chips on each side). But in this case we will have just 4GB of RAM instead of 8. Using 8-bit chips to increase the amount of RAM (number of chips) for each module would do the job, but not in case of M6400.
Having researched this info, I can now understand why it's not possible for us to use more that 16GB of RAM.

 

Could be a B. The laser writing is a bit off.

 

Sorry, I cannot get your idea. What do you mean?

 

It's a reply to this.

 

Oh, got it.
I'm thinking on attaching a 20.1" screen from HP HDX9000 via LVDS. It would be the best Core2 laptop ever.

 

Quite cheap

 

Still boots up though. However, that liquid spill might cause other intermittent issues.

 

If it boots up fine, everything's alright. Just need to check the keyboard

 

I bought orange body parts, orange battery and the fingerprint sensor panel with a ribbon cable and turned my casual M6400 into the covet version. But I didn't want to put the glass on the screen as I don't like having things mirrored on the screen.