I bought a new video card msi r9 270x and install it on my old motherboard intel DP55WB, but when i try to turn on the computer its beeps twice and wont torn on the display.
when ive tried to put back my old card (4870) it works fine.
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It appears to be an issue with compatibility. I have checked video cards specifications, the R9 270x is PCI express version 3.0. The motherboard is PCI Express 2.0 and if the new card does not work it may be that this is down clocking to version 2.1. Or, there is a possibility that you need higher power supply.
The version of the PCI Express slot. In this case your motherboard supports 2.0 and your video card 3.0, some of the video cards can down clock the version of the PCI Express revision. But as I mentioned, this might be a compatibility issue because your old video card is working properly.
The card is fully compatible with pcie 2.
So I think it's something with the board!
Maybe there is some BIOS update that I need to install?
You could try update BIOS to the latest: 0336
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21524 Intel® Download Center