No one seems to stop and think that even the grandest videocard on the planet will not run games like FEAR or Oblivion at 2048x1024 with HDR, 4XAA and 8XAF at playable framerates - right now game vendors have pushed the advantages of the new hardware beyond what the fastest is capable of doing completely maxxed out.
You'll find with most PC games - that extra 'HIGHEST' settings for stuff like AA and AF or even resolution increases don't make a tangible difference in how good the game gets. It looks it's 'best' somewhere in the 'medium' to 'high' range of settings and going the extra mile to 'highest' on everything only hurts performance with little/no improvement in image quality. It's been a long-standing tradeoff between image quality and framerate, and STILL people think they can have EVERYTHING with BOTH - it simply doesn't work that way.
You seem to have made the most logical post on these forumz in sometime. What's the point in spending $749US for a eVGA 7900ztfcvjfegssa or a ATI x19,000,000gtoprk graphics card and it not support 4/8AA or AF on games like Oblivion. Those like yourself understand this is rediculous and should view the XBOX 360 or the PS3 as the door to HIGH DEFINITION gaming (even though Microsoft pulled out the 'ole 12 incher and shafted us royally on the HD-DVD player). Obilivion was just ported to the XBOX 360 and it looks fabulous. So fabulous you can see the reflection of yourself in the eyeballs of your opponent.
Now tell me, can that eVGA card do that? Remember, jnjkele just told us no, it can't. Time and time again I keep saying the XBOX 360 is here and gaming is fabulous. You hardcore PC gamers out there are being stiffed viciously. Microsoft has made it so much easier (and lighter on the wallet) to enjoy the most demanding and funnest games. I beg you to spend that money and try out an XBOX 360. I bet you'll be pleasantly surprised.
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SunAngel - Clearing the forumz out...one noob at a time!
*sigh* - I hate being taken out of context - you seem to have missed my point by carefuly evicerating the most relevant section of my post in favor of the snippet that can be taken out of context to support your point - my point here is that most newer graphics cards wont play games like oblivion with everything maxed at the highest resolution supported - if you're not happy with framerate, turn down the resolution or some of the detail - the basic fact remains that 'high def' console gaming is still not as high-resolution as PC-games and it is a fact that the graphics engines used by console games are dumbed down from their PC counterparts - just ask any developer familiar with the source, Unreal or doom game engines and they will tell you they are far more feature ritch than their console counterparts. I've seen games on both PC and X360 and the PC games still look better - more detailed than console *at the same resolution* - that's the key - your high def console is only as good as my low-resolution PC. i.e. my graphics card won't do as I indicated (2048x1024 everything maxed), but your high def console won't even come close - it's highest resolution is 1024x768, and at that resolution, certainly my evga 7800GT will certainly play with everything maxed and look better than the console.
Aside from that - can your X360 keep track of my finances, or email, or browse the web (ok, it might do that), or give me the option of interfacing with my game in 3 dozen different ways (controllers) insead of a single hand-cramping, carpal tunnel inducing controller, or allow me to interact with others around the world outside of the context of a game? Consoles are so limited in their application that even with the quirks, I'd still take a PC over console any day. BTW - I own both a PC and a console and I spend much more time on my PC.
When all is said and done the most important thing to remember is that 'to each his own' and if you like console gaming, more power to ya - I simply don't like the interface and find the graphics to be lower quality than my PC (and yes, I have played an X360).
And at the end of it all - to the original poster: it sounds to me like you don't really have much of an issue - like someone mentioned slightly above, if your performance is dropping of 25-30% (instead of 5) then you would have something to be concerned about, otherwise you are seeing the natural variations that come with running benchmarks a small number of times.
Enjoy the game - I really don't think you can honestly 'feel' the difference between the two framerates. If the frame counter wasn't running would you know the difference? I know I can't tell when my framerate drops a few FPS. (your eye can't distinguish anything beyond 30fps anyway, so anything higher than 30 and it's mostly academic.)
Peace