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I would second Michele here but before concluding this discussion, I would quickly give you a response to your question.
DP45SG has been tested with a few third-party parts, of which here are the following GPUs:
GALAXY* GF 9600GT PCI-e 512MB DDR3 256Bit w/HDTV/Dual DVI NVIDIA* EN9800GTX EVGA* GeForce 8800 GTS Nvidia 7900 Asus* Nvidia EN9800 GTX Gigabyte* 8800GTS 512MB. D3306 Nvidia 7600GT ASUS NVIDIA EN8500GT Silent Magic Geforce NVIDIA 8600 GT Nvdia Quadro FX 1700 NVIDIA EN8400GS ATI* HD3870 PNY* NVIDIA Quadro NVS 290
Moreover, this m/board has PCI-X slots on it and that would support any modern GPU with PCI-X interface so yours should fit. As for your budget, Rs. 25, 000/- for the desired hardware would not be sufficient, I don't have any pricing for India but this I know for sure that your current budget might not be enough especially with UPS to be purchased.
For more information and other system related queries, kindly post in the community as pointed by Michele.
Thank you, have a nice day!
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