There is more to video config than the options in the UI. Check dxconfig 
and you'll find a load of different stuff. Now that I think about it 
some of the downgrading is done with dxlevel checks in materials, and 
you won't get that, but there are still improvements to be made.

On 07/05/2010 8:13, jetscope wrote:
> That's simply not true, there's a huge difference between DX8 and DX9
> performance that's not related to quality settings in any way, at least in
> TF2. On my home PC which uses an X1300, I've noticed at least a 10 FPS
> difference between the two DX levels with the exact same quality settings in
> TF2. I don't know what makes it so much more expensive to render, but I'm
> guessing it has to do with the Phong shader since turning down shader
> settings improves my framerates quite a bit under DX9 (though they still
> never reach DX8 rates).
>
> On Fri, May 7, 2010 at 8:59 PM, Tom Edwards<[email protected]>wrote:
>
>    
>> That's largely because of the lower video settings it enforces. You
>> could get the same performance under DX9 if you applied the relevant
>> cvars from dxconfig.cfg.
>>
>> On 07/05/2010 4:42, jetscope wrote:
>>      
>>> I believe this data is largely irrelevant. I'm pretty sure this 5% is,
>>>        
>> more
>>      
>>> specifically, users whose video cards support DX8 at most - i.e., people
>>>        
>> who
>>      
>>> don't support DX9 at all. However, many people whose video cards do
>>>        
>> support
>>      
>>> DX9 - like me - still run games under DX8 simply because it's much
>>>        
>> faster.
>>      
>>> On Fri, May 7, 2010 at 5:22 PM, Olly<[email protected]>   wrote:
>>>
>>>
>>>        
>>>> Nope, only ~5% of steam users (that took part) still use DX8.
>>>>
>>>> http://store.steampowered.com/hwsurvey
>>>>
>>>> On 7 May 2010 15:57, Ryan Sheffer<[email protected]>   wrote:
>>>>
>>>>
>>>>          
>>>>> A lot of dx8 users still.
>>>>>
>>>>> ~Ryan
>>>>>
>>>>> On May 7, 2010, at 6:19 AM, Marek Sieradzki
>>>>> <[email protected]>   wrote:
>>>>>
>>>>>
>>>>>            
>>>>>> On Fri, May 7, 2010 at 1:16 PM, Christopher Fortner<[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>              
>>>>>>> Im trying to track down the problem, so far ive reached the psa.exe,
>>>>>>> wich gets called in the psh_prep.pl,
>>>>>>> this file executes the following command:
>>>>>>>
>>>>>>> ..\..\dx9sdk\utilities\psa /Foshader0.o /nologo
>>>>>>> SDK_emissive_scroll_blended_pass_dx8_ps11.psh>   NIL
>>>>>>>
>>>>>>> wich makes psa.exe output the following error:
>>>>>>>
>>>>>>> assembly failed; no code produced
>>>>>>>
>>>>>>> Im unsure how to display debugging information about this process,
>>>>>>> any
>>>>>>> ideas about this error?
>>>>>>> Google isnt showing any results regarding it.
>>>>>>>
>>>>>>>
>>>>>>>                
>>>>>> Come on. Who cares about DX8 and .psh/.vsh? Just use DX9 and SM 2.0
>>>>>> or higher.
>>>>>>
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>>>>>>
>>>>>>
>>>>>>              
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>>>>>
>>>>>
>>>>>
>>>>>            
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>>>>
>>>>          
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>>>        
>> please visit:
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>>>
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>>>
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