Alright, your video card is drawing 43 watts, which your pci-e slot, not a problem since the pci-e can distribute up to 75 watts to the card.
If you can play games such as Tomb Raider, you'd also see the throttling, it would happen anytime you went into 3-D mode.
Shall we stop this nonsense about the psu now?
Edit:As mentioned, your 3D'06 is normal for your set up, nothing odd about it at all.
Let's throw this into the mix as well.
What is a good 3dmark06 score these days??
3D Mark 06 = 2151
My System:
P4 3.2 w/HT, 2mb L2, 800mhz fsb
X1650Pro 512mb DDR2, 8x AGP (oc'd to 661.5 core / 463.50 memory using ATI Tool 0.27)
2gb PC3200 400mhz Patriot mamory
Antec 550W PSU
WD 80gb 7200rpm HD
Seagate 160gb 7200rpm HD
My video card was lagging on the first 2 tests (6 fps average), but the CPU really bogged down in its tests (>1 fps average). However the 2nd set of tests for my video card was averaging 14 fps. Aparently my video card is better at HDR.
Please note that in games like World of Warcraft I generally get 60fps and in a busy city I hold about 42. And Oblivion runs without any issues at stock settings.