In the lead up to the imminent launch of the Nvidia GeForce GTX 900 series, final specifications for the two top-end cards - the GTX 980 and GTX 970 - have been leaked thanks to

The GTX 980 flagship will reportedly come with 2,048 CUDA cores across 16 Streaming Multiprocessors Maxwell (SMM) units, up from the previously-rumored 1,920. It'll also feature 4 GB of GDDR5 memory on a 256-bit bus, providing 224 GB/s of bandwidth, while the card's TDP is listed at around 175 W.

The TDP is especially interesting, considering it's much lower than the previous generation. The Kepler-based GTX 780 with its GK110 GPU had a TDP of 250 W, so if these specifications are accurate, we're looking at a 75 W drop in TDP in switching to a Maxwell architecture on the same 28nm fabrication node.

In comparison, AMD's Radeon R9 290X has a TDP of 290 W, so if the GTX 980 really does outperform it, it'll be even more impressive when you consider the TDP is over 100 W lower.

The GTX 970 will come with 13 SMMs, equating to 1,664 CUDA cores. It has the same memory specifications as the GTX 980, and has a TDP of just 148 W, down 82 W from the 230 W GTX 770. Again, it's looking like Nvidia will have a significant performance-to-power advantage over AMD with their Maxwell architecture.

It won't be too long until we know for sure how the GTX 900 series performs, and what the final specifications for the cards really are. Nvidia is expected to launch their new series of GPUs at the end of this week.