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标题: 6790 [打印本页]

作者: Edison    时间: 2011-3-29 16:35
标题: 6790
http://www.nordichardware.com/news/71-graphics/42743-exclusive-radeon-hd-6790-based-on-barts-le-with-800-sps.html

AMD will on March 31st launch the new mid-range card Radeon HD 6790. After we recently revealed the launch date we now have the specifications that turned out to be similar to those of the Radeon HD 6800 family, since the card is based on a GPU from the Barts series.

               UPDATE: We just learned that AMD has postponed the launch to the 5th of April, probably to give AIB's more time to get their cards ready for the market. We will have more information on this and the power usage issue later today.

AMD Radeon HD 6790 will use a graphics circuit called Barts LE and as we implied in our initial article on the new card the similarities with the more powerful Radeon HD 6800 series are quite striking.

Barts LE uses AMD's classic VLIW5 architecture and will get 10 SM units (Streaming Multiprocessor) with access to a total of 800 stream processors. This can be compared to 12 SM units and 960 stream processors in Radeon HD 6850 that is based on Barts Pro.

Radeon HD 6790 has beside fewer processing units the same bus width at 256-bit and relatively powerful clock frequencies. The GPU operates at 840 MHz while the memory shuffles data at 1050 MHz (4200 MHz effectively). All to put NVIDIA's newcomer GeForce GTX 550 Ti in its place and offer a more powerful alternative to Radeon HD 5770, at a lower price than Radeon HD 6850.




[td]

HD 6790HD 6850HD 6870
GPUBarts LEBarts ProBarts XT
Node40nm40nm40nm
Die size
255 mm2255 mm2255 mm2
Transistors1.7 Billion1.7 Billion1.7 Billion
SM units10
12
14
Stream processors800
960
1120
GPU frequency
840 MHz775 MHz900 MHz
Performance1.34 TFLOPs1.5 TFLOPs2.0 TFLOPs
Texture units
4048
56
Texture fillrate33.6 Gtexel/s37.2 Gtexel/s50.4 Gtexel/s
ROPs32
32
32
Memory type
GDDR5GDDR5GDDR5
Memory buffer
1GB1GB1GB
Memory frequency
1050 MHz
(4200MHz)
1000 MHz
(4000MHz)
1050 MHz
(4200MHz)
Bus width
256-bit256-bit256-bit
Bandwidth134.4 GB/s128 GB/s134.4 GB/s
Power connectors
2 x 6-pin1 x 6-pin2 x 6-pin
Power consumption
19/150W19/129W19/151W

NVIDIA chose to launch a relatively crippled card in a higher product series, GeForce GTX 550 Ti, which runs the risk of confusing the consumers. AMD has done the opposite. Radeon HD 6790 is with the Barts LE GPU a toned down version of Radeon HD 6850 and could very well have been named Radeon HD 6830. Instead AMD chooses to lift the card into the Radeon HD 6700 series.

Radeon HD 6790 - Worse performance at higher power consumption?The last piece of the specification is a bit confusing. Radeon HD 6790 is expected to perform worse than Radeon HD 6850, but still consume more power. AMD has specified the power consumption to maximal 150 watt, which can be compared to 129 watt for Radeon HD 6850 or 151 watt for Radeon HD 6870. With relatively high GPU and memory frequencies this sounds a lot like the launch of Radeon HD 5830 where AMD managed to launch a card that despite worse performance consumed more power than the faster brother.

Considering GeForce GTX 550 Ti is rated at 116 watt we can't really find a way to justify how Radeon HD 6790 can consume 150 watt, but this is what our sources are telling us. On March 31st we will know exactly what the number will be, but AMD has not developed a new GPU for Radeon HD 6000 but instead uses the well established Barts architecture.


作者: heavenboy    时间: 2011-3-29 16:37
就是个低功耗 dx11的4890嘛。。
作者: gtx5    时间: 2011-3-29 16:38
gtx560 se.................{lol:]
作者: presenter    时间: 2011-3-29 16:48
阉割的居然功耗更高
作者: gtx5    时间: 2011-3-29 16:50
presenter 发表于 2011-3-29 16:48
阉割的居然功耗更高

这不是明摆着可以开核吗
作者: teddytao    时间: 2011-3-29 16:53
支持6790 静待测试结果。
作者: 黎明前的辉煌    时间: 2011-3-29 17:14
不知道比5830怎样
作者: 380    时间: 2011-3-29 17:20
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作者: rickerlian    时间: 2011-3-29 17:24
更期待开核
作者: goldman948    时间: 2011-3-29 17:37
有5830的霸气
作者: iamspy    时间: 2011-3-29 17:51
本帖最后由 iamspy 于 2011-3-29 19:47 编辑

AMD又***了,明显应该叫6830的这卡。如果SP不动,ROP砍半,才会是6790。
作者: amx004    时间: 2011-3-29 18:16
看来是主打开核的份
作者: yellowfly    时间: 2011-3-29 19:05
回复 iamspy 的帖子

6830吧~~~
其实我更期待4D新架构的中低端产品···

作者: scowl    时间: 2011-3-29 19:52
这才叫诚意啊

我了个去

这得把550 TI秒成什么样啊

价格明显也会低啊    毕竟6850普遍到1199了
作者: emu10kx    时间: 2011-3-29 19:53
有吸引力  
作者: wqllz    时间: 2011-3-29 20:08
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作者: trevorlee    时间: 2011-3-29 20:09
本帖最后由 trevorlee 于 2011-3-29 20:09 编辑

居然是BARTS。。。我还是喜欢Juniper多点。
作者: wangzhizhi    时间: 2011-3-29 20:11
也不知道能不能开核{lol:]
作者: 乱世火凤凰    时间: 2011-3-29 20:13
这卡性能应该会和GTX460 768/GTX460 1G SE同级别,大概落后GTX460/6850 10-15%这样子。上市价999?

其实作为玩家,我更乐意看到6970直接砍半的HD6700系列,4D+768SP+16ROP+128bitGDDR5,频率可以直接就是880/4800,推算性能也刚好填空了5770和6850之间的空白
作者: hakase    时间: 2011-3-29 20:13
预设频率好高,秒550Ti不在话下。
作者: 魏武    时间: 2011-3-30 03:25
6790变身6870
作者: 66666    时间: 2011-3-30 06:58
Elwin 发表于 2011-3-29 20:08
貌似双6pin用在A卡身上都不吱声了。

这卡这频率,性能不会比6850差。

有个词叫选择性无视,换N卡性能再高多一6pin肯定给某群体作为攻击重点
作者: mikeee146    时间: 2011-3-30 07:35
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作者: gz_easy    时间: 2011-3-30 10:28
硬规格缩了,Power consumption反而高了。
作者: enzyme    时间: 2011-3-30 10:40
本帖最后由 enzyme 于 2011-3-30 10:40 编辑

看消息,好像最终rop还是被阉割成16个了,果然没有什么惊喜的,这卡如果叫6830肯定又是个悲剧。
作者: loverlong    时间: 2011-3-30 10:51
enzyme 发表于 2011-3-30 10:40
看消息,好像最终rop还是被阉割成16个了,果然没有什么惊喜的,这卡如果叫6830肯定又是个悲剧。

跑3DM11必然能像5830那样雄起。

作者: presenter    时间: 2011-3-30 10:58
380 发表于 2011-3-29 17:20
频率高啊

只是显存频率都是4200,其他参数都低啊,可待机和满载功耗几乎一致

作者: 梦游的猪    时间: 2011-3-30 11:17
功耗高于6850?厉害!
作者: jason_sean    时间: 2011-3-30 12:08
ROPs 到底是32还是16?
作者: justwater    时间: 2011-3-30 12:09
**太抠门了,核心上加个盖子会死啊
作者: snoopy1    时间: 2011-3-30 14:38
justwater 发表于 2011-3-30 12:09
**太抠门了,核心上加个盖子会死啊

A卡不是N卡 A卡几乎没有加盖子的
作者: angeldiy    时间: 2011-3-30 15:18
期待可以开核心
作者: iamspy    时间: 2011-3-30 16:18
enzyme 发表于 2011-3-30 10:40
看消息,好像最终rop还是被阉割成16个了,果然没有什么惊喜的,这卡如果叫6830肯定又是个悲剧。

我最前面就说了。这不和常理。如果是这个规格,肯定应该叫6830。只有ROP砍半,才会叫6790。
我也倾向于爆料错误,实际6790规格应该是16ROP。

作者: Answer4eveR    时间: 2011-3-30 16:49
双6pin...
彻底无语了
作者: mgwogui    时间: 2011-3-30 20:16
证实了ROPs 是16不是32




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