AMD's Radeon HD 5870: Bringing About the Next Generation Of GPUs
by Ryan Smith on September 23, 2009 9:00 AM EST- Posted in
- GPUs
The Race is Over: 8-channel LPCM, TrueHD & DTS-HD MA Bitstreaming
It's now been over a year since I first explained the horrible state of Blu-ray audio on the PC. I'm not talking about music discs, but rather the audio component of any Blu-ray movie. It boils down to this: without an expensive sound card it's impossible to send compressed Dolby TrueHD or DTS-HD Master Audio streams from your HTPC to an AV receiver or pre-processor. Thankfully AMD, Intel and later NVIDIA gave us a stopgap solution that allowed HTPCs, when equipped with the right IGP/GPU, to decode those high-definition audio streams and send them uncompressed over HDMI. The feature is commonly known as 8-channel LPCM support and without it all high end HTPC users would be forced into spending another $150 - $250 on a sound card like the Auzentech HomeTheater HD I just recently reviewed.
For a while I'd heard that ATI was dropping 8-channel LPCM support from RV870 because of cost issues. Thankfully, those rumors turned out to be completely untrue. Not only does the Radeon HD 5870 support 8-channel LPCM output over HDMI like its predecessor, but it can now also bitstream Dolby TrueHD and DTS-HD MA. It is the first and only video card to be able to do this, but I expect others to follow over the next year.
The Radeon HD 5870 is first and foremost a card for gamers, so unless you're building a dual-purpose HTPC, this isn't the one you're going to want to use. If you can wait, the smaller derivatives of the RV870 core will also have bitstreaming support for TrueHD/DTS-HD MA. If you can't and have a deep enough HTPC case, the 5870 will work.
In addition to full bitstreaming support, the 5870 also features ATI's UVD2 (Universal Video Decoder). The engine allows for complete hardware offload of all H.264, MPEG-2 and VC1 decoding. There haven't been many changes to the UVD2 engine; you can still run all of the color adjusting post-processing effects and accelerate a maximum of two 1080p streams at the same time.
ATI claims that the GPU now supports Blu-ray playback/acceleration in Aero mode, but I found that in my testing the UI still defaulted to basic mode.
To take advantage of the 5870's bitstreaming support I had to use a pre-release version of Cyberlink's PowerDVD 9. The public version of the software should be out in another week or so. To enable TrueHD/DTS-HD MA bitstreaming you have to select the "Non-decoded high-definition audio to external device" option in the audio settings panel:
With that selected the player won't attempt to decode any audio but rather pass the encoded stream over HDMI to your receiver. In this case I had an Integra DTC-9.8 on the other end of the cable and my first test was Bolt, a DTS-HD MA title. Much to my amazement, it worked on the first try:
No HDPC errors, no strange player issues, nothing - it just worked.
Next up was Dolby TrueHD. I tried American History X first but the best I could get out of it was Dolby Digital. I swapped in Transformers and found the same. This ended up being an issue with the early PowerDVD 9 build, similar to issues with the version of the player needed for the Auzentech HomeTheater HD. Switching audio output modes a couple of times seemed to fix the problem, I now had both DTS-HD MA and Dolby TrueHD bitstreaming from the Radeon HD 5870 to my receiver.
One strange artifact during my testing was the 5870 apparently delivered 1080i output to my JVC RS2 projector. I'm not exactly sure what went wrong here as 1080p wasn't an issue on any other display I used. I ran out of time before I could figure out the cause of the problem but I expect it's an early compatibility issue.
I can't begin to express how relieving it is to finally have GPUs that implement a protected audio path capable of handling these overly encrypted audio streams. Within a year everything from high end GPUs to chipsets with integrated graphics will have this functionality.
Facebook
Twitter
RSS
327 Comments
View All Comments
JonnyDough - Wednesday, September 23, 2009 - link
They could probably use a 1.5 GB card. :(yacoub - Wednesday, September 23, 2009 - link
why is the 5870 so freaking LONG??I'm pretty sure you could land aircraft on it.
http://images.anandtech.com/reviews/video/ATI/5870...">http://images.anandtech.com/reviews/video/ATI/5870...
Someone should photoshop a person into that image for scale. They'd be standing in the shadow underneath the PCIe connector, waving at you, and there would be an F-35 JSF circling like a fly trying to land on the deck.
Ryan Smith - Wednesday, September 23, 2009 - link
It's your standard, full-length 10.5" card. It's the same as the GTX cards and the 4870X2Here's a shot comparing it to a GTX 285 and a 4890 that I didn't get to use in the article.
http://images.anandtech.com/reviews/video/ATI/5870...">http://images.anandtech.com/reviews/video/ATI/5870...
SiliconDoc - Monday, September 28, 2009 - link
If you can't see the 5870 is the longest card in that pic, then you've got different problems than just lying issues.Another one, another big fat fib, with pic included, that proves the fib to be a fab fib.
It's amazing.
---
"No, everyone, do not believe your lying eyes, it's a standard 10.5" measured in the new red rooster barnyard stick."
Cripes call International Weights and Measures, we have warped space time around the new ati card it's so powerful.
LSnK - Wednesday, September 23, 2009 - link
Or plainly spoken, angle independent angle-dependent filtering. How confusing.frozentundra123456 - Wednesday, September 23, 2009 - link
Mildly disappointed in the initial results for this card. It is powerful,admittedly, but it has less than twice the performance of the 4870. Also does not use less power. Maybe I was expecting too much. It surely is not a giant step up like the introduction of the 4xxx series cards. I was hoping for another big leap in performance per watt.I have a feeling that nVidia's 300 series will beat it when it finally comes out, although hopefully ATI will still be ahead in performance per watt and performance per dollar.
I hope they make a good low/midrange card like the 4670 that does not require external power but has increased performance.
Spoelie - Wednesday, September 23, 2009 - link
I reckon you'll see performance improve the coming months, as ATi's compiler improves to use the new instructions more efficiently. The card you see here today will not be the one fighting GT300.Granted, it won't make huge strides, but I guesstimate it to be 5-10% better, depending on circumstance/game, by the november-january timeframe (when GT300 hopefully lands).
Nvidia's baby will probably still be faster, but if the margin turns out to be slim, we'll have another rv770 vs GT200 situation playing out. And when the first wave of DX11 games have hit, somewhere next year, it'll be time to reevaluate again ;).
JonnyDough - Wednesday, September 23, 2009 - link
and I stopped. I had to post this:"Sometimes a surprise is nice. Other times it’s nice for things to go as planned for once.
Compared to the HD 4800 series launch, AMD’s launch of the HD 5800 series today is going to fall in to the latter category. There are no last-minute announcements or pricing games, or NDAs that get rolled back unexpectedly. Today’s launch is about as normal as a new GPU launch can get."
If it's normal for all that crap to happen, wouldn't it be ABNORMAL for AMD to have a great launch? :)
SiliconDoc - Wednesday, September 23, 2009 - link
LOL" . Today’s launch is about as normal as a new GPU launch can get."
I guess he meant "for reviewers" - since the "normal launch" today is "listed on the websites for sale, but greyed out, not available, or pre-order" - meaning NO STOCK.
---
Yehah buddy, that is a "as normal as any launch" so long as it's the immensely favored ATI launching, and not that hated greedy Nvidia...
A normal launch and you can't buy the card...rofl.
JonnyDough - Thursday, September 24, 2009 - link
I wasn't being a fanboi, merely mocking normal launches from several companies. Seems like paper launches almost became the norm for awhile. :P