A couple presentation slides got leaked for CeBIT and reveal the final specs of nVIDIA’s new performance-mainstream card. The GTX 550 Ti comes with 24 ROPs/32 TMUs/192 CUDA Cores and a 192-bit memory interface with 1GB of GDDR5. Wonder how that works huh? Memory chips are 32bit and you need six of them to give you a 192-bit wide bus, so nVIDIA is using four 1Gbit (128MB) and two 2Gbit chips (256MB) to get a total of 1GB memory on the card.
In addition to more ROPs and the wider memory interface the clocks were raised to 900/1800/4100MHz (GPU/CUDA Cores/Memory), so the GTX 550 Ti should give a nice performance boost compared to the GTS 450 on higher resolutions and AA enabled. The TDP increased a bit from 106 to 116W. The card comes with two DualLink-DVIs and one mini-HDMI for connectivity. MSRP should be somehere around the 129-149USD mark.