FYI, frame-rate in FSX does not necessarily mean much. Most people lock it at 20 - 30 fps so they can actually, unlike you, fly faster than 250 knots without the memory turning to mush. I can see it in your screenshots btw, the ground scenery does not even look that good as opposed to, here, here, here, here, and here. I'm betting I can get more FPS on a Pentium 4 / X800 than you... doesn't mean it's playable at all though.
Your simulation:

(unknown speed, 17.8fps, very blurred ground, very little autogen)
My simulation:

(459 knots, 26.0fps, autogen maxed out, ground crystal clear.... it's difficult to read becase I'm at 1920x1080, resizing the picture down to 1024 makes the text small..)
ANYONE can unlock the framerate, load up the 2d cockpit, point the noise into a blank sky and say... "WOW, look how good my computer is".... but in reality it means ABSOLUTELY NOTHING. You were getting 17.8fps when the ground turned into a mush - NOT SOMETHING TO BRAG ABOUT.
btw, maybe you should read Nicks fsx optimisation stickies at the top of the FSX forum... because I am thoroughly UNIMPRESSED by your sim at this moment. Mine looks better, runs better, and I'm on slower hardware.

That's 424.5 fps btw and my sim is not even optimized. It was jumping to over 500 but I couldn't be bothered wasting more time trying to grab a screenshot of it. specs: Core 2 Quad Q6600 @ 3.0ghz & 8800GT (stock clocks).
What actually does matter, however, is the actual experience the hardware gives. It is incredibly naive to think that Phenom II will outperform the i7, when in actuality, the i7 outperforms the Phenom II in every single benchmark, and also overclocks further.
BTW, the op needs a new videocard. IT might be good advice to recommend him the Radeon 5850, and Radeon 5870. But it is absolutely treacherous to recommend a Phenom II to him when he already has a MUCH faster Core i7. BTW, ATi can do clouds, only they get a bigger hit from them. Try enabling light bloom, water 2.0x max, max autogen, and 5 layers of cumulus clouds above a city, in PMDG MD-11 virtual cockpit, and you tell me how it runs. And yes, members like Nick Needham have tried both ATi and Nvidia. If you don't like it then ask him.... this is what he said...:
[quote]Because Ati cards are designed for shader driver rendering engines and FS9/FSX is a old school triangle rendering engine that requires a video core which is targeted at CPU bound render code which Nvidia still caters too.
and if anyone here wants to tell me ATi runs FS9/FSX better or equal to Nvidia under equal weather conditions and high load payware aircraft then that tells me they are clueless from the neck, up when it comes to hardware technology
You guys are welcome to use what you want but dont EVER post I am some kind of fanboy freak.. What I post comes from 45 years of being a lead engineer in the aerospace industry and if you think you can argue tech