X1900XTX Lower 3d clock speeds on core

[$carecrow]

Firstly Hi to all
I have a small query maybe some kind person can help me with, I purchased a X1900XTX from Overclockers uk it was a connect3d card, the 1st was artifacting so they replaced within the 28 days initial period, the second had a faulty dvi port which caused a flicker after 2 months, this was sent back to C3D and 1 month later I have got a new card back from them. Now when I look in CCC I see that the requested 3d speeds are core 641, mem 774, memory looks fine but core is slightly low only 7mhz on the 2 previous cards I have had. So I try to overclock it with overdrive and it is not having any of it with any cats from 6.3 upto 6.7 and the bios carries a higher number than the bios in the Ati collection on this site, i am alittle paranoid that they have given me a b grade card or it is a X1900XT flashed to XTX ish speeds due to short supply of product etc any suggestions why this could be and is it worth me flashing to a earlier bios, as on this site? I have never used a flashing tool for a Grfx card before and I am a little wary of this! My other two cards appeared stable at 689/798 and can not understanxd why this one is not having any overclocking at all!

Thanks in advance for any help

[DRDNA]

can you tell if it has a xtx bios or a xt bios?

[$carecrow]

Well the bios info is this

BIOS Version 009.012.005.002

BIOS Part Number 113-A52021-110

BIOS Date 2006/04/24

I can not check the memory chips as this would void my warranty if i remove the HSF.

Something is not right with this card!!!!!!!

[DRDNA]

I would reflash the card with a bios from >>> http://www.techpowerup.com/bios/ and flash your card be sure to grag the correct bios though, I see there is not one for connect3d but there is one from sapphire that should work. !!!Let me know what happens

[$carecrow]

Is there any thing other than make sure that overdrive is off before i flash? Also when I extract my current bios it is saved as a rom file and the bioses that are downloadable are in bin format, I just want to know that if something goes horribly wrong then I can reflash back to the C3D one and do not want any hiccups with the differant file types. One last thing there is a Connect 3d one there dated 21/12/2005 would that be ok or would you go for the Sapphire one you said?

[DRDNA]

ya the different extention are normal and some people have had to knock thier clocks back to 500/500 in order to get the flash to work ,I my self have not had to set clocks back and no problem with the flash.