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RV740  (Source: Guru of 3D)

  (Source: Guru of 3D)
Benchmarks place it comfortably between the HD4830 and HD4850

Despite an uncharacteristically tight-lipped stance from ATI on its first 40nm parts, hardware review website Guru of 3D has managed to secure a sample of an RV740-based graphics card and put it through the paces. At first glance, the specifications suggest that it is little more than a shrunken RV770LE core, but a closer look reveals several improvements

According to the preview published today, the GPU boasts 640 shaders, 32 TMUs, and 16 ROPs; all the same as the RV770LE. However, the core and memory clocks both receive a significant bump, up from 575MHz to 650MHz and 1800MHz GDDR3 to 3200MHz GDDR5 respectively. The substantial boost in memory frequency works to offset the performance difference incurred by the smaller 128-bit memory bus on the RV740, which brings the reported math processing rate for the GPU up to 900 GigaFLOPS.

Every single benchmark result published in the review places the RV740-based card right between the existing Radeon HD4830 and HD4850 graphics cards, also from ATI. For example, at 8xMSAA and 16xAF in the popular first person shooter Left 4 Dead, the RV740 turns in 28 FPS, flanked by scores of 25 and 30FPS from the two cards at 2560x1600 resolution. The card does exhibit a significant performance drop at higher resolutions, likely the result of the 128-bit memory bus width and the relatively low 512MB of memory. Other reported benchmarks include Far Cry 2, Crysis WARHEAD, Call of Duty 5: World at War, Brothers in Arms: Hell’s Highway, and 3DMark Vantage.

MSRP for RV740-based graphics cards is expected to be $99 USD, which should make it a very attractive offering in the upper-mainstream segment. While the official name of the video card has not been released, the author of the article suspects it would be called the Radeon HD4750, which would be a logical name for a card with the given characteristics.



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RE: EDID corruption
By Motoman on 2/25/2009 4:24:24 PM , Rating: 2
...at the possible risk of exposing my own ignorance, what is EDID? I have used/shipped an awful lot of ATI video cards since the 3xxx series hit, and haven't heard any complaints...


RE: EDID corruption
By bankerdude on 2/25/2009 4:29:08 PM , Rating: 2
EDID= Extended Display Identification Data


RE: EDID corruption
By Motoman on 2/25/2009 4:32:27 PM , Rating: 2
Ah. What is it that ATI is screwing up here, and is it something that everyone should be seeing?


RE: EDID corruption
By bankerdude on 2/25/2009 4:38:48 PM , Rating: 2
EDID is what a display uses to describe its identity and capabilities to a source, such as video formats, audio formats, lip-sync delays, etc. The source (e.g. ATI graphics card, DVD, STB, etc) can then select output (e.g. video formats) in accordance with what the display supports. Honestly I've seen my fair share of EDID corruption on Nvidia as well.


RE: EDID corruption
By Samus on 2/25/2009 4:43:19 PM , Rating: 2
What happens when EDID corruption occures?

BTW $100 for a card this powerful is pretty damn good, especially when it will likely sell for $80-$90.


RE: EDID corruption
By Clauzii on 2/25/2009 8:21:30 PM , Rating: 2
On my XP installation it shows in that I have to set Resolution and Refreshrate from the right-click desktop-properties. If I use CCC, all resolutions are at 60Hz. No big deal, if You know that other way around.

PS: A big applause for the ATI DNA-drivers. My AGP AH3650SILENT (ASUS) will finally run 3DMark05 and work with CCC. It's funny that the card only runs with the Sapphire Hotfix driver (not all things working..) or the DNA-brilliant-one. But NOT the driver from ASUS???.. oh well..


RE: EDID corruption
By omnicronx on 2/25/2009 4:33:58 PM , Rating: 2
Wiki:Extended display identification data (EDID) is a data structure provided by a computer display to describe its capabilities to a graphics card. It is what enables a modern personal computer to know what kind of monitor is connected. EDID is defined by a standard published by the Video Electronics Standards Association (VESA). The EDID includes manufacturer name, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.

In my case, (and many others) for whatever reason my ati card screws with the EDID information when connecting via HDMI to my receiver, and then to my TV. It essentially strips off the TV's information, and results in a black screen. VGA output is not effected, this will only happen when using DVI or HDMI. I had to manually override my display driver edid information to get it to display correctly.

You can see why this may be a problem for HTPC users.


RE: EDID corruption
By Motoman on 2/25/2009 4:35:54 PM , Rating: 2
...that is interesting, and would explain why I haven't heard of it yet because I don't know of anyone using their machines for HTPC type uses.

Perhaps ironically, though, I just ordered parts for my own self to build an HTPC for our use - including an HD4870 (I wants to play WoW on teh big screen FTW!!1!). Reckon I'll find out...


RE: EDID corruption
By omnicronx on 2/25/2009 4:47:07 PM , Rating: 2
quote:
Perhaps ironically, though, I just ordered parts for my own self to build an HTPC for our use - including an HD4870 (I wants to play WoW on teh big screen FTW!!1!). Reckon I'll find out...
Well if you have an issue, it can be retified although it can be a paintfull process.

http://www.avsforum.com/avs-vb/showthread.php?t=10...

This is the issue I had, I didn't get a blank screen, but I could only use certain resolutions and I got no sound through HDMI until I manually overrode my EDID information.


RE: EDID corruption
By omnicronx on 2/25/2009 5:16:11 PM , Rating: 2
I would also like to point out the fix only works for Vista/7. Anyone using XP will has been left in the dark.

Furthermore even with the fix I am limited to 48khz sound for whatever reason.


RE: EDID corruption
By Motoman on 2/25/2009 6:17:10 PM , Rating: 2
...well that looks like fun.

I guess I'll be wary when I put my own HTPC together. Hopefully won't run into any issue.

I wonder...is it a particular interaction between ATI cards and a particular brand/range of recivers? Applies to all video cards? Applies to all recivers?


RE: EDID corruption
By Motoman on 2/25/2009 4:36:50 PM , Rating: 2
A thought: isn't it possible that having the reciver in the middle is causing the issue? If for some reason the reciever isn't passing through this data correctly?


RE: EDID corruption
By omnicronx on 2/25/2009 4:44:23 PM , Rating: 2
quote:
A thought: isn't it possible that having the reciver in the middle is causing the issue?
In my case, without a doubt, it works perfectly if I attach it straight to the TV. This being said my receiver has no problem with any other device attached via hdmi (I have a 360, PS3 and HD-DVD player all using HDMI without issue). It is the video card that for whatever reason is incorrectly reading the EDID information.


RE: EDID corruption
By Motoman on 2/25/2009 4:49:42 PM , Rating: 3
...do we know for a fact that consoles and Hd-DVD players need/use EDID in the same way?

It just seems to me that if the video card works fine when connected directly to the TV, that in and of itself, it has no problem reading/using EDID...and that therefore it is most logical to presume that *something* the reciever is doing is the source of thoe issue...


RE: EDID corruption
By omnicronx on 2/25/2009 5:09:17 PM , Rating: 2
quote:
...do we know for a fact that consoles and Hd-DVD players need/use EDID in the same way?
They should, for example if I turn on my 360 and my receiver is not on, it will think that I am incapable of 5.1 surround sound and will default back to 2ch. If I have my amp on, it will read the edid information and 5.1 works without a hitch.

HDMI/HDCP handshake is definitely part of the problem, but there is no reason I should have to override this information in the software if the video card is not to blame. (keep in mind I have both my amp and TV on when I boot my computer, the issue of having one of the devices off when I boot my PC is not related to the issue I am having) HDMI works perfectly fine without the override until I boot into windows, thats what makes me think this is an Video card issue (and I am not alone in thinking this)


RE: EDID corruption
By Motoman on 2/25/2009 6:18:29 PM , Rating: 3
...don't suppose you have an Nvidia card laying around you could test with, using all the other same components? Would be an interesting exercise.


RE: EDID corruption
By Targon on 2/25/2009 4:58:11 PM , Rating: 2
It may be the DVI to HDMI connector supplied with the video card. I have heard(but not verified) that the one provided tends to be problematic, while others that can be ordered online will work a LOT better.


RE: EDID corruption
By omnicronx on 2/25/2009 5:10:43 PM , Rating: 2
This is also an issue, but in my case I don't use DVI at all. I have a physical HDMI port.


RE: EDID corruption
By SunAngel on 2/25/2009 7:49:43 PM , Rating: 2
I had a similiar problem with the HD2400XT (w/o a fan). My Sony XBR could not be read with the card. But, I then switched to a HD2600XT (with a fan) and the EDID info was read correctly.

Well let me back track for a moment. the 2400 would read as high as 1280x720 when connected but my tv is 1080p. Going back and looking at the spec for the 2400 it never explicitedly said 1080p. So, that when I decided to go up a notch to the 2600XT. Low and behold it worked, except now I have to deal with fan noise.


RE: EDID corruption
By William Gaatjes on 2/26/2009 10:48:02 AM , Rating: 2
When crt monitors where a big item and lcd monitors started to emerge, ddc appeared :

http://en.wikipedia.org/wiki/Display_Data_Channel

quote:
The Display Data Channel or DDC is a digital connection between a computer display and a graphics adapter that allows the display to communicate its specifications to the adapter. The standard was created by the Video Electronics Standards Association (VESA).


Seems to me edid is the renamed, improved and extended version of ddc.

http://en.wikipedia.org/wiki/Extended_display_iden...

quote:
Extended display identification data (EDID) is a data structure provided by a computer display to describe its capabilities to a graphics card. It is what enables a modern personal computer to know what kind of monitor is connected. EDID is defined by a standard published by the Video Electronics Standards Association (VESA). The EDID includes manufacturer name, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.


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