There's a 520, yes, but then you're talking entry level. Those things can barely play HD video, let alone run a modern game. For comparison, a GT 520 has 48 cores, a GTX 550 Ti has 192 and a GTX 460/560 has 336 (384 for 560 Ti, making it literally twice the card as the 550 Ti, the GTX imho is really a misnomer). Depending on who you ask, a 460/560 can still be considered low-end (personally I'd say mid-range, with 570 taking high-end and 580 'enthusiast' segments, but you could argue that with the 560 Ti being about, a 460/560 is indeed low-ish for a modern card).
The 545 is an OEM card and shouldn't be on shelves.
And yeah, bit of a redundancy... especially since we're talking Nvidia. How these companies aren't sued into bankruptcy I'll never know.
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