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[lordvader129]

1.6s dont have the extra slots for more ram, youll have to get older versions to do a ram upgrade

to answer your other questions, softmods can utilize the extra ram, and all the ram should be compatible, except 1.6b which has hynix ram (the samsung ram on a 1.6a should be compatible with older xboxes)
http://www.xboxscene.../versions_6.php

[2 Bunny]

Sorry to "hijack" this thread, but does this mean that on my version 1 XBox I could just take some extra RAM and solder it in? Where does it go on? How much more can be added?

- 2 Bunny

[Bomb Bloke]

There are four empty chip positions on the motherboard (two on the top, two on the bottom). The new chips need to be soldered directly onto these. All four positions must be filled in order for the system to be able to use the added RAM, and as each chip holds 16mb, the total boost is 64mb (for an overall total of 128mb).

Each chip has something like 100 points that need to be individually soldered. Patience is required in abundance. It's not a one-day job, especially not for the first try.

As far as I know, softmods cannot access the additional RAM. It may be that the final versions changed this, but I'm doubting it. EvoX BIOSes certainly won't work with it.

Retail games don't benefit from the extra RAM (at least, to any measurable extent), and neither does XBMC. Only a small handful of emulators (plus Linux) will see any improvement.

XBMC will not slow down when it runs low on RAM - if it runs out, it'll simply stop what it was doing, or take it a step further and go into full system lock. For better playback results, you'd be best off re-encoding/transcoding your material to use less demanding codecs.