4 chips in 6 months.

This is the schedule AMD’s GPU engineering teams committed themselves to for the launch of the Evergreen family. The entire family from top to bottom would be launched in a 6 month period.

Last month AMD took the first step of that plan with the launch of Cypress, the forebear of the family and the source of the Radeon HD 5870 and 5850. Today AMD is taking the next step in the launch of the Evergreen family by delivering the 2nd and final Evergreen chip of the year: Juniper. Or as the products based off of them are known as, the Radeon HD 5770 and 5750.

  ATI Radeon HD 5870 ATI Radeon HD 5850 ATI Radeon HD 5770 ATI Radeon HD 5750
ATI Radeon HD 4870
ATI Radeon HD 4850
Stream Processors 1600 1440 800 720 800 800
Texture Units 80 72 40 36 40 40
ROPs 32 32 16 16 16 16
Core Clock 850MHz 725MHz 850MHz 700MHz 750MHz 625MHz
Memory Clock 1.2GHz (4.8GHz data rate) GDDR5 1GHz (4GHz data rate) GDDR5 1.2GHz (4.8GHz data rate) GDDR5 1.15GHz (4.6GHz data rate) GDDR5 900MHz (3600MHz data rate) GDDR5 993MHz (1986MHz data rate) GDDR3
Memory Bus Width 256-bit 256-bit 128-bit 128-bit 256-bit 256-bit
Frame Buffer 1GB 1GB 1GB 1GB / 512MB 1GB 1GB / 512MB
Transistor Count 2.15B 2.15B 1.04B 1.04B 956M 956M
TDP 188W 151W 108W 86W 150W 110W
Manufacturing Process TSMC 40nm TSMC 40nm TSMC 40nm TSMC 40nm TSMC 55nm TSMC 55nm
Price Point $379 $259 $159 $129 / $109 $140-$160 $109-$129

In our 5800 series launch article, we briefly discussed Juniper and the other members of the Evergreen family. With Cypress a bit too big and a bit too expensive to hit mainstream prices, a new chip was introduced in to AMD’s usual 3 chip stack to cover that segment of the market, and that chip was Juniper.

What’s Juniper? In a nutshell, it’s all of Cypress’ features with half the functional units (and no Double Precision for you scientist types). DirectX 11, Eyefinity, angle-independent anisotropic filtering, HDMI bitstreaming, and supersample anti-aliasing are all accounted for. For more information on these features, please see our Radeon 5870 launch article from last month.

With half of the functional units left behind, we’re left with 10 SIMDs, giving us 800 stream processors and 40 texture units, while the ROP count has also been cut in half to 16, in turn giving us a 128-bit memory bus. If Cypress was 2 RV770s put together, then Juniper is the closest thing you’re going to see to RV770 coming out of the Evergreen family.


Juniper

With the reduction in functional units, Juniper becomes a leaner and meaner core. The transistor count is 1.04 billion, a little less than half of Cypress and about 100 million more than RV770. The die size of this resulting core is 166mm2, significantly less than both Cypress and RV770, the latter due to the smaller process size. RV770 for comparison was 260mm2.

From Juniper we are getting the 5770 and the 5750. The 5770 is a full Juniper, with all of Juniper’s functional units enabled and the card running at what amounts to a full speed of 850MHz (the same as 5850). The 5750 is slightly cut down, much like 5850 is compared to 5870. Here we have 1 SIMD disabled, and the core clock reduced to 700MHz. This is a notable departure from how AMD handled the 4870/4850 split, where 4850 was differentiated using a slightly slower core and much slower RAM, without the need to disable any SIMDs.

The smaller Juniper core also affords these cards lower power usage than the 5800 series. The 5770 is 108W at load and 18W at idle, meanwhile the 5750 is 86W at load and 16W at idle.

As an interesting aside, when AMD started sampling Evergreen cards to game development houses and other 3rd parties, they were Juniper based, and not Cypress based. The Juniper team was rather proud of this, particularly since Juniper came back from TSMC second. They also had less time to get their GPU up and working than the Cypress team did, since they had to wait on Cypress before being able to finish work on some elements. This is what makes AMD’s 6 month rollout all the more impressive, since it means the non-Cypress teams had less time to get their work done than they have in previous product cycles.

Meet The 5770
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  • Anand Lal Shimpi - Tuesday, October 13, 2009 - link

    I don't like to make a habit of disagreeing with Ryan, but unfortunately only Cypress based cards support double precision. The 57xx series does *not* support double precision.

    Take care,
    Anand
    Reply
  • MadMan007 - Tuesday, October 13, 2009 - link

    So where is the double precision implemented? I didn't bother too look it up by I imagine it's buried deep in the shaders. If so why take it out? Is it just disabled or not present at all? If not present I guess I could see removal for the sake of fewer transistors but otherwise it seems like artificial market segmentation. On the other hand hardcore compute power people where time = $$ won't have a problem getting a 5850 or better, or seeing what NV does. Reply
  • CarrellK - Wednesday, October 14, 2009 - link

    DPFP (Double Precision Floating Point) is physically not in the Juniper GPU - it is not artificial segmentation. We had to choose between giving you a GPU that would be great for consumer HPC and games at a price you could afford, or something that cost notably more.

    There are virtually zero consumer applications that need DPFP.

    CarrellK
    Reply
  • stmok - Tuesday, October 13, 2009 - link

    According to ATI's Stream SDK v1.4 page...

    Desktop cards that support double precision: Radeon HD 3690, 3830, 3850, 3870, 3870 X2, 4770, 4830, 4850, 4850 X2, 4870, 4870 X2, 4890.

    Mobile GPUs that support double precision: Mobiliy Radeon 3850
    3870, 4850, 4850X2, 4870

    None of their IGPs support it.

    Their newer Stream SDK 2.0 series (currently in Beta 4), mentions they now support OpenCL in GPU, and that the Radeon HD 5870, 5850, 5770, and 5750 are supported. No mentioned of which can actually do double precision though...

    Still, considering the 5770 looks similar in spec to the 4870/4850, it may support it. (The major difference seems to be the Memory Bus Width.)

    Come to think of it, what are the requirements to support double precision on a Radeon HD-series GPU?
    Reply
  • codedivine - Tuesday, October 13, 2009 - link

    Thats sad :( .. thanks for the info!
    Reply
  • Ryan Smith - Tuesday, October 13, 2009 - link

    My understanding is that it's available in the entire Evergreen lineup. So I'm going to give you a tentative "yes". Reply
  • codedivine - Tuesday, October 13, 2009 - link

    Thanks! Reply
  • endlesszeal - Tuesday, October 13, 2009 - link

    As always from anandtech, great review. However, I almost crapped my pants when I saw the price of a "display port to dvi" dongle," $100?? Hope thats not the average not inflated by Apple price. =) Reply
  • Zingam - Tuesday, October 13, 2009 - link

    You don't really need that dongle anyway. Reply
  • Ryan Smith - Tuesday, October 13, 2009 - link

    Actually, the Apple adapter is still the only active adapter I'm aware of that's widely available. So yes, that $100 is because of the Apple price. Reply

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