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ATI Radeon HD 5830: Bridging The 5700- And 5800- Price Gap

The Radeon HD 5830 Architecture

There are a lot of graphics cards from AMD in and surrounding the new Radeon HD 5830's price point, so let's have a look at the relevant players:

Radeon HD 5850Radeon HD 5830Radeon HD 5770Radeon HD 4890
Shader Processors:1,4401,120800800
Texture Units:72564040
Color ROPs:32161616
Core Clock:725 MHz800 MHz850 MHz850 MHz
GDDR5 Memory Clock:1,000 MHz1,000 MHz1,200 MHz975 MHz
Memory Bus:256-bit256-bit128-bit256-bit
Memory Bandwidth (GB/s):12812876.8124.8
Compute Power (TFLOPs):2.091.791.361.6
Transistors (billion):2.152.151.040.959
Maximum Power:151W175W108W190W
Idle Power:27W25W18W60W

There's so much information to process here. At first glance, the new Radeon HD 5830 seems to completely outclass the Radeon HD 5770 with far higher memory bandwidth and almost a third more shader cores. Indeed, the new card looks comparable to the powerful Radeon HD 5850. Yes, there's a 22% reduction in shader cores, but there's also a 10% increase in GPU core clock speed to help offset the deficit.

Things look exceptionally positive for the new Radeon HD 5830 until you notice its Achilles heel: a lack of ROPs compared to the Radeon HD 5850. And we thought we were so very close to having Radeon HD 5850-class performance at $240! Of course, this is precisely the reason AMD cut the number of render back-ends in half compared to the Radeon HD 5870 and 5850. To put things in perspective, the Radeon HD 5830 might be able to execute shader operations almost as fast as the 5850, but its ability to render pixels to the screen has been crippled to the same specification as the Radeon HD 5770. We can expect the new Radeon HD 5830 to perform between the Radeons HD 5770 and 5850, but probably closer to the 5770 or Radeon HD 4890.

Speaking of the 4890, the Radeon HD 5830 looks to outclass it on all fronts, except the ROP count. Remember though, the Radeon HD 4000-series have been repeatedly proven to demonstrate a sizable shader-versus-shader performance advantage over the Radeon HD 5000-series when it comes to raw game performance. As a result, we'd expect the new card to demonstrate performance comparable to the Radeon HD 4890.

A Familiar Graphics Processor

The Radeon HD 5830 does not sport a new GPU, it simply employs the Radeon HD 5870 "Cypress" processor, crippled to the new specification and dubbed Cypress LE. In fact, AMD's power usage specifications suggest that the Radeon HD 5830 will be based on the high-end Radeon HD 5870 card instead of the smaller 5850. And our reference card was built on a full-sized Radeon HD 5870 PCB, though we'll go into that in more depth on the next page. For now, here is a Radeon HD 5870 block diagram that shows how much of the GPU has been disabled.

We've been through the Radeon HD 5000-series architecture in detail in our Radeon HD 5870 launch article so I won't rehash the minutia. We will look at the differences in the new Radeon HD 5830 though: as you can see, the new Radeon HD 5830 has 14 SIMD engines, compared to the 5870's 20, but only half of the render back-ends. We can definitely see where the performance bottleneck will lie. Each of the 14 SIMD engines hosts four texture units and 16 stream processors, and each stream processor with five ALUs (AMD calls these stream cores). As a result, this GPU boasts 1,120 stream cores and 56 texture units.

Note that the GPU retains its four 64-bit memory controllers, even though the number of render back-ends has been halved from four to two. Each render back-end contains eight color ROP units, resulting in a total of 16 ROPs and a 256-bit memory interface.

As with the rest of the Radeon HD 5000 family, AMD dedicated a lot of its transistor budget to features like DirectX 11 and Eyefinity. Of course, all of these features carry over to the Radeon HD 5830. With the aforementioned launches this month, we've covered them ad infinitum, so to read more about these features please check the other Radeon HD 5000-series stories linked to at the end of this piece.

  • jomofro39
    I love my 4890. I am sad they are disappearing, because I planned on getting a x-fire thing going in the next few months, and now I have to just try and get two 5770s and sell the 4890 I have now, obviously, so I can grab some DX11! Hurray for progress!
    Reply
  • meluvcookies
    I was hoping this would be just a bit cheaper such that the 5850 could finally come down nearer it's original MSRP. Unfortunately, it doesn't look like we'll see those adjustments until closer to the summer.
    Reply
  • 4745454b
    To much money for such little card. Performance wise its just a really expensive 4890. A good buy at $200, but $240 is to much. Might as well pony up the extra $60 and get the 5850. 5810 is a bit more like it.
    Reply
  • flyinfinni
    seems more like a 5790 than a 5830 to me... Still- they are filling in the line quite well, and its gonna be interesting to see how Nvidia's new line will compare.
    Reply
  • intelx
    im a little disappointed about this one, i mean 239 and yet the 4890 is $40 cheaper and beats it in some new games, i was really hoping for better performance form the 5830, now after reading this, im leaning towards either 5770 in crossfire or single 5850.

    man ati is kicking Nvidia in every corner right now, all the way from low end to the high end 5970!
    Reply
  • intelx
    im a little disappointed about this one, i mean 239 and yet the 4890 is $40 cheaper and beats it in some new games, i was really hoping for better performance form the 5830, now after reading this, im leaning towards either 5770 in crossfire or single 5850.

    man ati is kicking Nvidia in every corner right now, all the way from low end to the high end 5970!
    Reply
  • acasel
    Where is the overclocking portion? If this thing overclocks good then it might be a worthy purchase..
    Reply
  • Aircraft123
    This article definitely made me feel better about my dual XFX 4890 CrossFire setup. Performance is theoretically around a GTX295 for less money than a single 5870!!!

    if the 5830 can come down to ~$200 and offer good crossfire performance perhaps with good overclocking potential I can see this card do very well.
    Reply
  • notty22
    ATI managed to cripple all the magic out of a 5850 with this thing.
    A gtx260 beats it in places and its only 10% faster than a 5770, thats 70 dollars cheaper ? Thanks , but NO Thanks.
    Reply
  • porksmuggler
    I've been waiting for this review, thanks Don. With the 4890 and 4850X2 still floating around for sale, this one isn't appealing even at $200. Performance is just too close to the 5770...
    Reply