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[Hardware]RV775 not coming. - Page 3

post #21 of 59
Quote:
SidePort is a mechanism for direct memory transfer between the 2 GPUs of the 4870X2.
Activating it with a driver release should provide an additional 5GB/s of additional bandwidth between GPU's onboard.

post #22 of 59
Quote:
Originally Posted by 45nm View Post
Activating it with a driver release should provide an additional 5GB/s of additional bandwidth between GPU's onboard.
correct
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post #23 of 59
Quote:
Originally Posted by pauldovi View Post
What is sideport?
From Anandtech - http://www.anandtech.com/video/showdoc.aspx?i=3372&p=3

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post #24 of 59
Thread Starter 
Quote:
Originally Posted by 45nm View Post
Activating it with a driver release should provide an additional 5GB/s of additional bandwidth between GPU's onboard.

nice find 45nm

i was looking for that because i had saw it before but you got their before me, plus i forgot where i saw it
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post #25 of 59
Thread Starter 
So this sideport is basically an extra door letting the flow in (like water) so it is import and exporting more at a faster rate than without sideport (extra door).
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post #26 of 59
Quote:
Originally Posted by ZealotKi11er View Post
ATI doesn't know how to milk card operantly.
AHHHHHHHHHHHH HAHAHAHAHA. I lol'd so hard.
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post #27 of 59
Quote:
Originally Posted by AlphaDog11790 View Post
SidePort is a mechanism for direct memory transfer between the 2 GPUs of the 4870X2.
Obviously it's a tough cat to skin, but why wouldn't they include Sideport by default in their drivers. If it's something they built into the card and driver architecture, shouldn't they be pushing this feature from release?
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post #28 of 59
Quote:
Originally Posted by C-bro View Post
Obviously it's a tough cat to skin, but why wouldn't they include Sideport by default in their drivers. If it's something they built into the card and driver architecture, shouldn't they be pushing this feature from release?
read this quote.
Quote:
According to AMD the performance impact is negligible, while average frame rates don't see a gain every now and then you'll see a boost in minimum frame rates. There's also an issue where power consumption could go up enough that you'd run out of power on the two PCIe power connectors on the board. Board manufacturers also have to lay out the additional lanes on the graphics card connecting the two GPUs, which does increase board costs (although ever so slightly).

AMD decided that since there's relatively no performance increase yet there's an increase in power consumption and board costs that it would make more sense to leave the feature disabled.

The reference 4870 X2 design includes hardware support for the CrossFire Sideport, assuming AMD would ever want to enable it via a software update. However, there's no hardware requirement that the GPU-to-GPU connection is included on partner designs. My concern is that in an effort to reduce costs we'll see some X2s ship without the Sideport traces laid out on the PCB, and then if AMD happens to enable the feature in its drivers later on some X2 users will be left in the dark.

I pushed AMD for a firm commitment on how it was going to handle future support for Sideport and honestly, right now, it's looking like the feature will never get enabled. AMD should have never mentioned that it ever existed, especially if there was a good chance that it wouldn't be enabled. AMD (or more specifically ATI) does have a history of making a big deal of GPU features that never get used (Truform anyone?), so it's not too unexpected but still annoying.
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post #29 of 59
Quote:
Originally Posted by C-bro View Post
Obviously it's a tough cat to skin, but why wouldn't they include Sideport by default in their drivers. If it's something they built into the card and driver architecture, shouldn't they be pushing this feature from release?
According to that same Anandtech article:

Quote:
According to AMD the performance impact is negligible, while average frame rates don't see a gain every now and then you'll see a boost in minimum frame rates. There's also an issue where power consumption could go up enough that you'd run out of power on the two PCIe power connectors on the board. Board manufacturers also have to lay out the additional lanes on the graphics card connecting the two GPUs, which does increase board costs (although ever so slightly).

AMD decided that since there's relatively no performance increase yet there's an increase in power consumption and board costs that it would make more sense to leave the feature disabled.

The reference 4870 X2 design includes hardware support for the CrossFire Sideport, assuming AMD would ever want to enable it via a software update. However, there's no hardware requirement that the GPU-to-GPU connection is included on partner designs. My concern is that in an effort to reduce costs we'll see some X2s ship without the Sideport traces laid out on the PCB, and then if AMD happens to enable the feature in its drivers later on some X2 users will be left in the dark.
Perhaps they will activiate it but they didn't need to at the launch of the HD4870X2, since the card outperformed any card Nvidia had and to keep the power consumption levels lower.
    
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post #30 of 59
Quote:
Perhaps they will activiate it but they didn't need to at the launch of the HD4870X2, since the card outperformed any card Nvidia had and to keep the power consumption levels lower.
I wonder what the power consumption levels are for a 4870 X2 under idle and load with sideport enabled and for one in CrossfireX.
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