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标题: 不走平常路, Radeon HD 7900 series将采用XDR2 [打印本页]

作者: gtx5 时间: 2011-9-6 20:32
标题: 不走平常路, Radeon HD 7900 series将采用XDR2
本帖最后由 gtx5 于 2011-9-6 20:52 编辑

http://www.nordichardware.com/news/71-graphics/44072-radeon-hd-7900-series-gets-new-architecture-and-xdr2-rambus-memory.html

AMD will launch its first graphics card in the Radeon HD 7000 family during the fall and as expected it will be the first VLIW4 circuits at 28nm. The top models of the Radeon HD 7900 series aims higher and will according to recently leaked roadmaps use the AMD Graphics Core Next architecture and the high speed memory XDR2 from Rambus.Radeon HD 7000 will like the current 6000 family launch in steps and with different base architectures. If we are to believe the latest information that is said to come from AMD's leaked roadmap the graphics card marker is aiming for a first launch in Q4 2011. Then it will be the latest VLIW4 architecture (Very Long Instruction Word) that is on the menu and it will most likely have the same base as the Radeon HD 6900 series. An archtiecture that will be more efficient than VLIW5 that was used by other Radeon HD 6000 cards.

AMD's first 28nm circuits may be based on the same base as Radeon HD 6900 series

AMD is planning four different GPUs based on the 28nm version of the VLIW4 architecture and use them in three different series, Radeon HD 7800, HD 7600 and HD 7500. The four GPUs will be equipped with 768 to 1536 Radeon cores (stream processors) and GDDR5 memory in high speeds.

Radeon HD 7870 is the top model based on the GPU Thames XT and according to the documents they will be made with TSMC's 28 nanometer HPL technology (High Performance Low-power). Despite specifications that are similar to the current top model Radeon HD 6970 - actually higher on several points - Radeon HD 7870 will get a maximal power consumption of only 120 watt, which is more than half of the 250 watt the 40nm precursor consumed.
Besides Thames XT we also have Thames Pro, Lombok XT and Lombok Pro where all use the same efficient 28nm technology with power consumption down to 50 watt.
Radeon HD 7900 series looks to be a question for the future - just like the Radeon HD 6900 series was. The reason is quite simple and it is abbreviated GCN. AMD Graphics Core Next is whole new and from the ground up designed GPU architecture that AMD has been talking about for some time now. The company has used a more programming friendly approach that will improve performance and functionality in GPGPU applications.

We have no concrete information on when Radeon HD 7900 series will launch, but most likely Q1 2012. AMD has chosen to use a more performance oriented node, TSMC's 28nm HP (High Performance) that will be ready later than HPL, but also have switched from GDDR5 to the pretty untested XDR2 technology.
XDR2 is made by Rambus and is marketed as the world's fastest memory system. Rambus claims that XDR2 offers twice the bandwidth of GDDR5 per circuit, while power consumption will be 30% less at the same performance.

The information that has leaked on Radeon HD 7900 series says that AMD will pair the new architecture with XDR2 memory at up to 8000 MHz, which in the flagship would result in a memory bandwidth of 256 GB/s over a 256-bit memory interface, comparable to 176 GB/s in Radeon HD 6790 with GDDR5 memory at 5500 MHz.

The unconfirmed information says that the flagship Radeon HD 7970 (Tahiti XT) will ship with 2048 Radeon cores and a GPU frequency of 1000 MHz, which should result in a performance to remember, but despite that the power consumption will only be 190 watt, thanks to the new node technology.
Radeon HD 7950 (Tahiti Pro) and Radeon HD 7990 (New Zeeland) are also mentioned. Where the latter is the first graphics card with dual GPUs based on the Graphics Core Next architecture.
AMD looks to have something really exciting coing over the coming six months, but this is unconfirmed information that we may very well be fake. Either way it sounds likely that AMD will start its 28nm launch of Southern Islands with VLIW4 and later introduce Graphics Core Next. Whether the untested XDR2 memory technology will appear or not, we don't know, but if so it will be worth to look closer at.

Graphics card	Radeon HD 7970	Radeon HD 7950	Radeon HD 6970
Node	TSMC 28nm HP	TSMC 28nm HP	TSMC 40nm
Architecture	GCN	GCN	VLIW4
GPU	Tahiti XT	Tahiti Pro	Cayman XT
Radeon cluster	32	30	24
Radeon cores	2048	1920	1536
GPU frequency	1000 MHz	900 MHz	880 MHz
Texture units	128	120	96
ROPs	64	64	32
Graphics memory	2GB XDR2	2GB XDR2	2GB GDDR5
Memory frequency	8000 MHz	7200 MHz	5500 MHz
Memory interface	256 bit	256 bit	256 bit
Memory bandwidth	256 GB/s	230 GB/s	176 GB/s
Power consumption	190 watt	150 watt	250 watt

作者: coollab 时间: 2011-9-6 20:37
真的假的啊……有必要吗，那么贵！

作者: potomac 时间: 2011-9-6 20:46
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作者: luckissy 时间: 2011-9-6 20:46
我觉得不大可能你说GDDR6 我都可能信.

作者: luckissy 时间: 2011-9-6 20:47
{lol:]频率竟然还没过1GHz

作者: 左脚选手 时间: 2011-9-6 21:10
AMD是铁了心不上384bit显存位宽了。

作者: hyj201 时间: 2011-9-6 22:09
堆流处理器数量这个我信

作者: recruitbj 时间: 2011-9-6 22:30
let's see if the massage store is bragging.{sweat:]

作者: voodoocool 时间: 2011-9-6 22:31
我了各去,暴力堆積SP有沒有盡頭啊?

作者: inmark 时间: 2011-9-6 22:32
生产rambus的厂商有几个？这新闻不靠谱

作者: 左脚选手 时间: 2011-9-6 22:50

inmark 发表于 2011-9-6 22:32
生产rambus的厂商有几个？这新闻不靠谱

也就7970和7950这2个高端产品使用XDR2，这些高端显卡量很少。Rambus的生产厂商虽然不多，但是PS3这个比高端显卡量大得多的游戏主机都能满足供应，对7970和7950的供应应该不会有大问题。

作者: hjkissyou 时间: 2011-9-6 22:54
价钱应该不便宜。。。

作者: Alexdel 时间: 2011-9-6 23:07
功耗是亮点啊，这么低真是神了

作者: D65 时间: 2011-9-6 23:20

voodoocool 发表于 2011-9-6 22:31
我了各去,暴力堆積SP有沒有盡頭啊?

只要游戏机没换代，暴力堆积照样吃得开...

作者: askwex 时间: 2011-9-6 23:31
这出货时间还没准呢。。

作者: marsash 时间: 2011-9-7 00:51
本帖最后由 marsash 于 2011-9-7 00:52 编辑

现在ram这么便宜，难道用XDR2而不用GDDR5是为了维持高端显卡的高售价么？

作者: gtx5 时间: 2011-9-7 01:21

marsash 发表于 2011-9-7 00:51
现在ram这么便宜，难道用XDR2而不用GDDR5是为了维持高端显卡的高售价么？

AMD不想增加位宽
但GDDR5无法满足7900

作者: RacingPHT 时间: 2011-9-7 06:14
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作者: 66666 时间: 2011-9-7 08:14
不是说AMD用的是HPL么，这图上怎么写得是HP？

作者: just1984 时间: 2011-9-7 09:49
真要到2012 Q1啊。。。。

作者: yeemartin! 时间: 2011-9-7 10:21
本帖最后由 yeemartin! 于 2011-9-7 10:22 编辑

看来7870就是28nm版的6970，频率更高，功耗更低。

作者: whhwhhwhh 时间: 2011-9-7 13:00
6950开核的兄弟赚大了，有机会再次免费升级到 7870了哦

作者: readma 时间: 2011-9-7 14:23
10月能发布吗？

作者: G70 时间: 2011-9-7 14:46
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