[citation][nom]s3anister[/nom]They mean the Powercolor 7870 PCS+ Myst Edition. Since it's Tahiti LE it's technically a 7950 with more of the GPU disabled, hence the "7930" which is what it really is; the only thing it has in common with the 7870 is the GCN architecture.[/citation]
No, the 7870 XT also has two of the six 64 bit memory controllers disabled, making it perform more like an overclocked 7870 than like a 7950. It is using a cut-down Tahiti with poor binning, but its cut-down memory interface hurts it when it comes to overclocking and otherwise memory-bound situations.
Still, I agree that the 7930 is a more fitting name. It has the same GPU (albeit with a few more features cut-out) and it does CF with the 79xx series, not the 78xx series, so I can't think of a good reason to call it a 7870 XT, especially since the 7870's GPU has the XT suffix (Pitcairn XT)... It wouldn't be the first time that AMD had an x930 card (IE just last generation had the Radeon 6930, granted it wasn't really available in the USA).