Well, I'm about to spaz!

After installing the first video card, and going through the "step-by-step", I got pure crudsville. FSX was useless, unless you're into five second frame rates. But the aircraft *looked* good.
FS9 was a technicolor explosion. By that I mean most AC showed up as a strange mish-mash of of odd shapes and pieces (See the "flying junkyard" thread in FS9), and of course, was totally useless. I downloaded the latest drivers, absolutly not change.
Being slightly obsessive at this point, I bought another vid card, ad GeForce 8400 GS (It even has a screeny on the back of the box taken from FSX, a red Grumman Goose). Silly me, I took that as a good sign.
I went through and did everything, again, step by step.
Double checked the BIOS, it was set to PCI
Uninstalled the old drivers, powered off computer, removed power and vid cable, opened and removed old card, incerted new card (observing ESD safety precautions at all times.), buttened it back up, connected vid cable and power.
Powered back up and installed software. it did it's thing, then after rebooting again, installed DX 10.
I also went to the NVidia site and DL'd and installed the latest driver.
The exploding FS9 textures went away, with setting slides about mid to minimum, frame rates are still in the toilet. FSX runs at about 1 frame a second or two, with virtually all slides to the left (minimum).
But the aircraft look great.
Something is wrong here, since I used to be able to run FS9 with virtally all setting slides full right, and FSX with setting slides about mid-range with *no* video card.
What am I doing wrong?
