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GTX 970 has less L2 cache and less than rops Nvidia reported
The GTX 970 Nvidia has 56 instead of 64 rops rops, which the company initially advertised. Also the amount of L2 cache is 1792KB instead of 2048KB. According to Nvidia, it is a communication error.
The actual specifications came to light in elucidating the memory problem of the GTX 970. Nvidia said Monday at the press know that the card memory appeals in parts of 3,5GB and 512MB, the latter has lower memory throughput. However, this would give no influence on the performance. Meanwhile, Nvidia has to include PC Perspective , Tech Report and Anandtech given more details on the whole.
The basis of the problem lies in the ability to Maxwell to a malfunctioning unit, consisting of 8 rops and 256KB L2 cache off. Maxwell has four blocks with two memory controllers, and two parts of L2 cache. Each of those blocks communicates with the dram via two 32-bit memory interfaces. When switching from a rop / L2 unit both memory controllers can remain active. The remaining rop / L2 unit can not load two memory controllers. In order to still be able to communicate quickly with the memory, the memory is divided into a large pool of 3,5GB and one of 512MB. The 3,5GB large block of memory has priority over the memory of 512MB, making games that use memory to 3,5GB experience no performance problems.
GTX 970 chart
Thereby keep all 32bit interfaces, and a total of the 256bit memory bus, intact and Nvidia can also use imperfect chips. That is the reason that the Nvidia GTX 970 specifications, which can give to a large extent similar to those of the GTX 980, for a lower price. The disabled rop / L2 unit was not in documentation, as the reviewer’s guide mentioned by the GTX 970. According to Nvidia, the team that the marketing of the GTX 970 simply not kept informed.
According to Nvidia, the performance degradation games 4GB take the GTX 970 compared to the GTX 980 one to three percent. The company concludes that the selected functionality allows the card to a better product, but make some buyers on the Internet express their discontent over the initial misrepresentation of specifications.Viewing:-129
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