E1705 vs. M1710 vs. M90 more questions...

Hi,

I'm leaning between those three options.

Basically I want a system with relatively fast graphics, but some decent battery power as well.

If I configure the systems alike, I can put a 7900GS in the E1705 or the M1710, and a Quadro FX1500M in the M90.

1) Has anybody veryfied which clock speed the FX1500M runs at? Is it the same as the 7900GS? Then it would basically the same card...

2) If I use the same card in all three systems, would I still need the 130W power supply for the M90 and the M1710? I would be surprised if yes, because with the same cards, these systems don't have any difference (concerning power requirements) whatsoever, right?

3) Can anybody tell me battery runtimes of one of those systems, compared to the 7900GTX/FX2500M?
For example, I'd be interested in the maximum achievable runtime, by setting screen brightness to minimum, processor and graphics card to lowest speed - how much remaining time does the power meter then show on a full 9 cell battery?

4) What are the other differences?

- screen:
- M90 has a non-reflective screen
- does M1710 really have a brighter screen than the E1705, as was reported here? which one?

- E1705 has no Gigabit ethernet and no docking port

- M1710 is 1mm thicker as the other two, according to specs

- M90 has a smartcard reader (the others don't?)

- marginal differences in looks

- would there be any difference in weight between those systems? The E1705 is given with a minimal weight of 3.45kg, and with 3.59kg with the 9 cell battery. The M1710 is given with a weight of 3.99kg. Where do the remaining 400g come from? is it possible that the "minimum" weight for the E1705 is based on on-board graphics, and the graphics card (7900GS/GTX) weights 400g?

I'm asking because weight is an issue for me, I'd like the system to be as portable as possible, so every gramm counts. But if the E1705 with the 7900GS in the end has the same weight as the M1710/M90 anyway, I could go for those as well and have the dock-option and the gigabit ethernet.

Is anybody aware of any other difference between the three machines?

thanks for any insights!

So any takers for the remaining open questions? Pretty please?

Other system is not an option for me, 7900GS is the minimum graphics I need...

So nobody with an M1710/7900GS or M90/FX1500M?

Maybe an E1705/7900GS owner can report battery runtimes?

Ah, great, you have both an M90 and a 9300. Could you try the 90W PSU on the M90 and see whether it works?

Are the 3 hours on normal screen brightness, or with minimal screen brightness and max battery setting? This sounds quite low, as Sir Meili above also gets the 3 hours with an FX2500M, which is supposed to consume twice as much power...