dx10 without vista

[leo_vader]

here's the situation, i was planning to upgrade my gpu at around december this year and i was planning on making a long term invesment, to that purpoase i was going to buy a dx10 gpu, but lately i started reading some discouraging comments on windows vista(high requirements and no BIG improvements, apart dx10, 64 bit proccesors and aero glass-just eyecandy to me),my question is if using a dx 10 card without vista is going compromise performance in any way on applications that don't actually use dx10, any imput is welcome,opinions or official statemants.
and i did google it till i fall asleep.

 

[leo_vader]

i was saying i will have a dx10 card running dx9c applications on wind.xp,would it run slower than dx9c cards doing dx9c applications?and maebe i would change to vista after it becomes reasonable(gets better support and more games that worck on it)

sorry for beeng sow repetitive 😳

 

[mesarectifier]

,would it run slower than dx9c cards doing dx9c applications?

Does a DX9.0C card run DX8.0 tasks any slower than DX8.0 cards? No.

 

[leo_vader]

you sure, even if you consider the unified shader architecture?

 

[mesarectifier]

It's difficult to tell - the DX9 cards are just faster than the DX8 cards anyway, so theres no way they're gonna be slower. I'd imagine the same with DX10, especially seeing as the delay is so big and the rate the graphics market expands and changes.

 

[leo_vader]

does that mean i will have to archive all of my curent games after i make the transition to vista

 

[mesarectifier]

So DX9 will run on DX10 and Vista, but DX10 won't run on DX9 or XP?[/i]

 

[dmdallas]

but I heard that why directX 10 was only going to run on vista was because it was so "revolutionary" that it was incompatible with current and previous versions of vista and that directX 10 complient cards would be able to emulate previous DirectX's, but the word emulate kind of reeks of compatibility issues and poor performance to me, but who knows... this is all heresay and for all I know they might even throw out DirectX 10 altogether. or, an even more outlandish idea, microsoft actually devises a good productt hat runs DirectX 9 and before.

 

[mdd1963]

"Current DX9 cards will run Vista and DX10"

But what if the feature set of Vista includes Direct x 10 and the ability to play HD-DVD discs, which require the decoding keys to have been built into the gpu (or mainboard) at time of manufacturing?

With no decryption key....no watching HDDVD at high res...

I predict there will be several purchasers of $500-$600 cards that are going to be feeling a bit irate!

 

[mdd1963]

"DX10 cards and games probably will not run on XP, and DX9."

Couldn't Direct x 10.0 capable games be run with lesser 9.0 rendering features, as is already done with Direct x 9 games using older Direct x 8.0 cards? (I can;t imagine a single game producer that would be stupid enough, MS excluded, not to include backwards compatibility with WinXP and Direct x 9 rendering....