RTX 4080显卡预计将采用23Gbps GDDR6X显存，功耗达340W

根据Kopite7kimi的爆料，英伟达的GeForce RTX 4080显卡有了新的规格信息，改变了显存规格和功耗,NVIDIA利用更快的GDDR6X内存模块（显存为16GB大小），同时4080将获得23Gbps的速率。这也导致了功耗的略微提高，从之前的320W上升到340W。

不过，在其他GPU配置中，可能将之前预定配置的64MB的二级缓存和高达224个ROPs削减成48MB的二级缓存和较低的ROPs。

至于显卡内存规格，GeForce RTX 4080预计将采用16GB GDDR6X容量，据说在256位总线接口上以23Gbps的速度调整。这将提供高达736 GB/s的带宽。不过这仍然比RTX 3080提供的760 GB/s带宽慢一点，因为它有一个320位接口，但容量只有10 GB。英伟达可能会整合一个下一代内存压缩套件，以弥补256位接口的不足。

在功率方面，TBP的额定功率现在设定为340W，比我们之前得到的320W规格增加了20W。这使TBP与现有的RTX 3080显卡（高达350W）达到了相同的水平。现在还不知道其他RTX 40系列显卡是否也将获得更快的GDDR6X内存处理，不过目前美光已经开始全面大规模生产高达24Gbps的GDDR6X内存模块，总会有用到他们的地方。

NVIDIA's GeForce RTX 4080 graphics card has got a new spec update from leaker, Kopite7kimi, who reports even faster GDDR6X memory.
According to the leaker, most of the specifications for the NVIDIA GeForce RTX 4080 graphics card remain the same and the only thing that has changed is the memory spec and the power design. It looks like NVIDIA will be leveraging from Micron's faster GDDR6X memory modules, with the 4080 reportedly getting 23 Gbps dies. This spec update has also resulted in a slightly higher TBP, moving up to 340W from the previous 320W figure.
Let's make some updates. RTX 4080PG136/139-SKU360AD103-300-A19728FP3216GB 23Gbps GDDR6Xtotal card power 340W
— kopite7kimi (@kopite7kimi) August 23, 2022

NVIDIA GeForce RTX 4080 'Expected' Specifications
The NVIDIA GeForce RTX 4080 is expected to utilize a cut-down AD103-300 GPU configuration with 9,728 cores or 76 SMs enabled of the total 84 units whereas the previous configuration offered 80 SMs or 10,240 cores. While the full GPU comes packed with 64 MB of L2 cache and up to 224 ROPs, the RTX 4080 might end up with 48 MB of L2 cache and lower ROPs too due to its cut-down design. The card is expected to be based on the PG136/139-SKU360 PCB.
As for memory specs, the GeForce RTX 4080 is expected to rock 16 GB GDDR6X capacities that are said to be adjusted at 23 Gbps speeds across a 256-bit bus interface. This will provide up to 736 GB/s of bandwidth. This is still a tad bit slower than the 760 GB/s bandwidth offered by the RTX 3080 since it comes with a 320-bit interface but a lowly 10 GB capacity. To compensate for the lower bandwidth, NVIDIA could be integrating a next-gen memory compression suite to make up for the 256-bit interface.
For power, the TBP is now set to be rated at 340W, a 20W increase from the previous 320W spec that we got. This brings the TBP to the same ballpark as the existing RTX 3080 graphics card (up to 350W). Now it is not known whether the other RTX 40 series graphics cards will also be getting the faster GDDR6X memory treatment but we know that Micron has commenced full mass production of up to 24 Gbps GDDR6X memory modules so they have to go somewhere.
The NVIDIA GeForce RTX 4080 and RTX 4070 graphics cards will be amongst the first graphics cards besides the RTX 4090 to launch to gamers however we can't tell whether the green team plans to launch them within this year soon after RTX 4090 or wait till early next year. The RTX 4090 is so far expected to launch around October 2022.