Drivers do affect performance, heat and power very much. For instance, my 2x 5870 (Asus) went 3 degrees cooler (idle) with the latest driver.
TDU2 doesn't have to be demanding but from their own requirements it's clarly more demanding then I would've believed from graphical view. The amazing drawing distance in TDU2 is probably a big contributor to the reason. If you mix that with the huge and grately detailed world then it will demand even more. Especially if you're maxing the game's potential.
It is also wrong to compare TDU2 with TDU1, because the two games are running on two completely different game-engines. Which means they have been coded differently. So they will demand differently.
Nvidia GTX 465 = Released yesterday | Fermi 100 | Benchmark shows performance between HD5850 and HD5870
Nvidia GTX 460 = June 2010 | Fermi 104 | Will compete against HD5850
Nvidia GTS 450 = June 2010 | Fermi 104 | Will compete against HD5830
Nvidia GTS 440 = June 2010 | Fermi 104 | Will compete against HD5770
Nvidia GTS 430 = June 2010 | Fermi 104 | Will compete against HD5770
ATi FirePro™ V8800
ATi FirePro™ V8750
ATi FirePro™ V8700
ATi FirePro™ V7800
ATi FirePro™ V7750
ATi FirePro™ V8800
ATi FirePro™ V5800
ATi FirePro™ V5700
ATi FirePro™ V4800
ATi FirePro™ V3800
ATi FirePro™ V3750
ATi FirePro™ V3700
ATi FirePro™ RG220
ATi FirePro™ 2460 Multi-View
FirePro are cards with 3D technology. The V8800 also has an 2GB memory. The downside is that they are expensive. The best FirePro cards will cost well over $1000. 2 more Radeon cards are expected in late Q4 2010.
I haven't heard the 4870x2 before but it could be right.
Heres the loud sound of
anyways. Though a video won't let you hear it correctly, it will at leased give show you it's too loud, in my opinion.