Yes, I think your Dell is using these MXM cards, which never became a market success. You would only need the chip itself.LegendaryKA8 wrote:Hey... I'm a lurker, but taking a look at what you're trying to do here...
I own a first-gen Inspiron XPS; it replaced my T40 when my GPU issue cropped up and I needed another notebook fast(don't worry, the T40's been disassembled and waiting on the re-flow treatment). This machine has the Radeon Mobility 9800 and I've been using it for a couple months. I see two major obstacles to your upgrade path:
Firstly, the Mobility 9800 in the XPS is mounted on a separate card(Dell originally planned a series of 'upgrade' video cards as time went on, but they only delivered with the 9800). If you managed to get the T42's GPU off of the mainboard without damage you might not be as fortunate getting the 9800 back on, and I'd think the success rate would be pretty low.
Also, I'm not totally sure about the GPUs in the T4x notebooks, but aren't they using shared video memory? I can't really run mine right now so I'm not 100% sure. However, the 9800 is a 256MB onboard card and I'm not sure they'd be compatible.
And... the 9800 puts out some serious heat. The card itself has a heat sink about 2/3 the size of a T4x's long fan. If you managed to get that up and running in a T42 heat issues would be your biggest enemy, to be quite honest.
Don't get me wrong. The 9800's a pretty decent card. My XPS will run pretty much anything I'd care to play and run it decently(HL2 in particular is pretty smooth with max graphics settings). However, I don't think the upgrade would be possible in a T4x.
Yes, the 9800 is too hot (as every ATI chip is!), it will melt the T40 keyboard within minutes. Actually, the heat will be the main problem of the project.
The radeons use the Flexfit common interface and have their own memory on their top. There are cheap versions (IGP) that use shared memory but that is lame.
Actually, even with on-board memory the Radeons can use shared memory, which is I think called turbo-memory. Actually it is some kind of swapping like in old 8086 times.






