ATI Radeon HD 4850 Preview: AMD Delivers Performance for the Masses
by Anand Lal Shimpi & Derek Wilson on June 19, 2008 5:00 PM EST- Posted in
- GPUs
It's been one of those long nights, the type where you don't really sleep but rather nap here and there. Normally such nights are brought on by things like Nehalem, or NVIDIA's GT200 launch, but last night was its own unique flavor of all-nighter.
On Monday, AMD had a big press event to talk about its next-generation graphics architecture. We knew that a launch was impending but we had no hardware nor did we have an embargo date when reviews would lift, we were at AMD's mercy.
You may already know about one of AMD's new cards: the Radeon HD 4850. It briefly appeared for sale on Amazon, complete with specs, before eventually getting pulled off the site. It turns out that other retailers in Europe not only listed the card early but started selling them early. In an effort to make its performance embargoes meaningful, AMD moved some dates around.
Here's the deal: AMD is launching its new RV770 GPU next week, and just as the RV670 that came before it, it will be available in two versions. The first version we can talk about today: that's the Radeon HD 4850. The second version, well, just forget that I even mentioned that - you'll have to wait until the embargo lifts for more information there.
But we can't really talk about the Radeon HD 4850, we can only tell you how it performs and we can only tell you things you would know from actually having the card. The RV770 architectural details remain under NDA until next week as well. What we can tell you is how fast AMD's new $199 part is, but we can't tell you why it performs the way it does.
We've got no complaints as we'd much rather stay up all night benchmarking then try to put together another GT200 piece in a handful of hours. It simply wouldn't be possible and we wouldn't be able to do AMD's new chips justice.
What we've got here is the polar opposite of what NVIDIA just launched on Monday. While the GT200 is a 1.4 billion transistor chip found in $400 and $650 graphics cards, AMD's Radeon HD 4850 is...oh wait, I can't tell you the transistor count quite yet. Let's just say it's high, but not as high as GT200 :)
Again, we're not allowed to go into the architectural details of the RV770, the basis for the Radeon HD 4800 series including today's 4850, but we are allowed to share whatever data one could obtain from having access to the card itself, so let's get started.
Running GPU-Z we see that the Radeon HD 4850 shows up as having 800 stream processors, up from 320 in the Radeon HD 3800 series. Remember that the Radeon HD 3800 was built on TSMC's 55nm process and there simply isn't a smaller process available for AMD to use, so the 4800 most likely uses the same manufacturing process. With 2.5x the stream processor count, the RV770 isn't going to be a small chip, while we can't reveal transistor count quite yet you can make a reasonable guess.
Clock speeds are also fair game as they are reported within GPU-Z and AMD's Catalyst control panel:
That's a 625MHz core clock and 993MHz GDDR3 memory clock (1986MHz data rate). We've got more stream processors than the Radeon HD 3870, but they are clocked a bit lower to make up for the fact that there are 2.5x as many on the same manufacturing process.
| ATI Radeon HD 4850 | ATI Radeon HD 3870 | |
| Stream Processors | 800 | 320 |
| Texture Units | I can't tell you | 16 |
| ROPs | 16 | 16 |
| Core Clock | 625MHz | 775MHz+ |
| Memory Clock | 993MHz (1986MHz data rate) | 1125MHz (2250MHz data rate) |
| Memory Bus Width | 256-bit | 256-bit |
| Frame Buffer | 512MB | 512MB |
| Transistor Count | it's a secret | 666 million |
| Manufacturing Process | TSMC 55nm | TSMC 55nm |
| Price Point | $199 | $199 |
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npp - Thursday, June 19, 2008 - link
This is a fantastic card, and if it really sells for around 150€ here in Europe, this is the way to go. Very impressive offering from AMD, I'm simply amazed!The 4870 will often outperfotm the latest nVidia card, I guess... Combined with the supposed refusal of Intel to grant nVidia rights for designing chipsets featuring QPI links, this may mean hard times for the guys in green. They were a little early announcing a war on so many fronts, as it seems. Honestly speaking, I was tired from their domination and insane prices anyway, so this is a very nice turning point.
js01 - Thursday, June 19, 2008 - link
I knew there was a reason why I've stuck with amd for the last few years, because I always get my money's worth. It must be painful to be an early owner of a 9800gtx right now considering the huge price drop.BikeDude - Friday, June 20, 2008 - link
Why do you have to stay with a particular brand? Are you not free to pick and choose the best deal when you need it?Those who bought the 9800GTX a couple of months ago have been able to get a lot of good quality gaming going while some of us have been waiting for the next great thing. Personally I have been waiting for a while now, I still have a 7800GTX! Was the waiting worth it? I doubt so.
That said, I would really welcome some insight into the driver quality of nVidia drivers vs ATI. nVidia has been disappointing for the past two years. Instability, features gone missing, anomalies introduced (like resetting the colour profile in Vista after login), etc...etc... At one point I was unable to play a DVD for more than 30 minutes before my computer froze. Downgraded the driver and all was fine again. Luckily nVidia fixed that in a later release, but come on... That one was bad, and there's nowhere I can file bug reports.
brentpresley - Thursday, June 19, 2008 - link
Would be great if someone can run Folding At Home on this card and publish the performance.The new NV client is smoking right now, and lots of us are pondering buying cards to fold on.
KCjoker - Thursday, June 19, 2008 - link
it gets way too hot for a single slot card dumping the hot air inside the PC. Should be better when some aftermarket cards come out. But why does it draw that much power when the chip is much smaller than Nvidia's?epsilonparadox - Thursday, June 19, 2008 - link
From the hints in the article, I would assume this is a very large chip that nullifies any benefits the smaller process would have provided. Plus AMD chose a single slot solution which probably isn't doing a good job of cooling the chip.fungmak - Thursday, June 19, 2008 - link
Well the power that is drawn is about the same as a 9800 GTX.However, the 4850 is rumoured to have 950 million trannies compared to the 750 million of the GTX. Also, the die size is rumoured to be around 275mm2 compared to 330 mm"2, so slightly higher density, though i would imagine this is offsite by the reduciton in power due to 55nm compared to 65nm. So all in all the power draw is actually not too bad.
andreschmidt - Thursday, June 19, 2008 - link
956 million transistors on 55nm fabrication process ;)ImmortalZ - Thursday, June 19, 2008 - link
The Multi-GPU pages seem to be broken - they go straight to the search page.derek85 - Thursday, June 19, 2008 - link
No the links are fine actually... Anandtech took this article offline for a very short moment for some reason and I hit the same problem during that time.