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The last couple of weeks after the recent GeForce GTX 550 Ti launch have been more eventful than I had initially been expecting. As you may recall the GTX 550 Ti launched at $150, a price tag too high for its sub-6850 performance. I’m not sure in what order things happened – whether it was a price change or a competitive card that came first – but GTX 550 Ti prices have finally come down for some of the cards. The average price of the cheaper cards is now around $130, a more fitting price given the card’s performance.

The timing for this leads into today’s launch. AMD is launching a new card, the Radeon HD 6790, at that same $150 price point. Based on the same Barts GPU that powers the Radeon HD 6800 series, this is AMD’s customary 3rd tier product that we’ve come to expect after the 4830 and 5830. As we’ll see NVIDIA had good reason to drop the price on the GTX 550 if they didn’t already, but at the same time AMD must still deal with the rest of the competition: NVIDIA’s GTX 460 lineup, and of course AMD itself. So just how well does the 6790 stack up in the crowded $150 price segment? Let’s find out.

  AMD Radeon HD 6870 AMD Radeon HD 6850 AMD Radeon HD 5830 AMD Radeon HD 6790 AMD Radeon HD 5770
Stream Processors 1120 960 1120 800 800
Texture Units 56 48 56 40 40
ROPs 32 32 16 16 16
Core Clock 900MHz 775MHz 800MHz 840MHz 850MHz
Memory Clock 1.05GHz (4.2GHz data rate) GDDR5 1GHz (4GHz data rate) GDDR5 1GHz (4GHz data rate) GDDR5 1050MHz (4.2GHz data rate) GDDR5 1.2GHz (4.8GHz data rate) GDDR5
Memory Bus Width 256-bit 256-bit 256-bit 256-bit 128-bit
VRAM 1GB 1GB 1GB 1GB 1GB
FP64 N/A N/A 1/5 N/A N/A
Transistor Count 1.7B 1.7B 2.15B 1.7B 956M
Manufacturing Process TSMC 40nm TSMC 40nm TSMC 40nm TSMC 40nm TSMC 40nm
Price Point ~$200 ~$160 N/A $149 ~$110

3rd tier products didn’t get a great reputation last year. AMD and NVIDIA both launched such products based on their high-end GPUs – Cypress and GF100 respectively – and the resulting Radeon HD 5830 and GeForce GTX 465 were eventually eclipsed by the GeForce GTX 460 that was cooler, quieter, and better performing at the same if not lower price. The problem with 3rd tier products is that they’re difficult to balance; 1st tier products are fully enabled parts that are the performance kings, and 2nd tier products are the budget minded parts that trade some performance for lower power consumption and all that follows.

While 2nd tier products are largely composed of salvaged GPUs that couldn’t make it as a 1st tier product, the lower power requirements and prices make the resulting video card a solid product. But where do 3rd tier products come from? It’s everything that couldn’t pass muster as a 2nd tier product – more damaged units functional units that won’t operate at lower voltages like a 2nd tier product. The GTX 465 and Radeon HD 5830 embodied this with power consumption of a 1st tier card and the performance of a last generation card, which made them difficult to recommend. This does not mean that a 3rd tier card can’t be good – the Radeon HD 4830 and GTX 260 C216 were fairly well received – but it’s a difficult hurdle to overcome.

Launching today is the Radeon HD 6790, the 3rd tier Barts part and like the rest of the Barts-based lineup, the direct descendent of its 5800 series counterpart, in this case the Radeon HD 5830. As is to be expected, the 6790 is further cut-down from the 6850, losing 2 SIMD units and half of its ROPs; mitigating this some are higher clockspeeds for both the core and the memory. With 800 SPs and 16 ROPs operating at 840MHz, on paper the 6790 looks a lot like a Radeon HD 5770 with a 256bit bus, albeit one that’s clocked slower given the 6790’s 1050MHz (4.2GHz data rate) memory clock.

From the 5830 we learned that losing the ROPs hurts far more than the SPs, and we’re expecting much of the same here; total pixel pushing power is halved, and MSAA performance also takes a dive in this situation. Overall the 6790 has 90% of the shading/texturing, 54% of the ROP capacity, half the L2 cache, and 105% of the memory bandwidth of the 6850. Or to compare it to the 5770, it has 98% of the shading/texturing capacity, 98% of the ROP capacity, and 175% of the memory bandwidth, not accounting for the architectural differences between Barts and Juniper.

Further extending the 5830 comparison, as with the 5830 AMD is leaving the design of the card in the hands of their partners. The card being sampled to the press is based on the 6870’s cooler and PCB, as the 6790’s 150W TDP is almost identical to the 151W TDP of the 6870, however like the 5830 no one will be shipping a card using this design. Instead all of AMD’s partners will be using their own in-house designs, so we’ll be seeing a variety of coolers and PCBs in use. Accordingly while we can still take a look at the performance of the card, our power, temperature, and noise data will not match any retail card – power consumption should be very close however.

At 150W AMD is skirting the requirement for 2 PCIe power sockets. Being based on a 6870 our sample uses 2 sockets and any other design using a 6870 PCB verbatim should be similar, but some cards will ship with only a single socket. This doesn’t impact the power requirements of the card – it’s roughly 150W either way – but it makes the card more compatible with lower-wattage PSUs that only come with 1 PCIe power plug.

As we mentioned previously, AMD is launching the 6790 at $150. With the GTX 550’s price drop its direct competitor is no longer the GTX 550, but rather the closest competitor is now cheap GTX 460 768MB cards, which on average are about the same $150. AMD’s internal competition is the 6850, which averages closer to $160. Technically the Radeon HD 5770 is also competition, but with it going for around $110 after rebate, it’s far more value priced than the 6790 is.

Meanwhile the 6790 name also marks the first time we’ve seen the 6700 series in the retail market. In the OEM market AMD has rebadged the 5700 series as the 6700 series, however that change won’t ever be coming to the retail market, making this the only 6700 series card we’ll see. It’s a bit odd to see one series shared by two GPUs so significantly different, but AMD bases this on the fact that the 5770/6770 and the 6790 are so close in terms of specs; they want to frame the 6790 in terms of the 5770/6770, rather than in terms of the 6800 series. If nothing else it’s a nice correction for the poor naming of the 6800 series; a 6830 would have been the 5830 but slower.

April 2011 Video Card MSRPs
NVIDIA Price AMD
  $700 Radeon HD 6990
$480  
$320 Radeon HD 6970
$240 Radeon HD 6950 1GB
  $200 Radeon HD 6870
$160 Radeon HD 6850
$150 Radeon HD 6790
$130  
 
$110 Radeon HD 5770

 

The Test
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  • deputc26 - Tuesday, April 05, 2011 - link

    On the last page.
    "and it would make NVIDIA think long and hard about what to do with what to do with the GTX 460 768MB"

    Oh and this comments section never remembers me despite always ticking the "remember me" box, (W7 Chrome)... annoying
    Reply
  • Belard - Tuesday, April 05, 2011 - link

    Why not just reduce the price of a 6850 a bit more... And calling it the 6830 wouldn't have hurt that much - since AMD totally screwup the model names of the entire 6000 series.

    Pretty much everyone knows the 6800s are cheaper and slightly updated 5800s.

    Think I'll wait until the 7000s come out... but that maybe in 2012.
    Reply
  • enterco - Tuesday, April 05, 2011 - link

    So, 6790 looks like a 5770 with a little performance improvement. For a 5770 / 450 owner it doesn't make any sense. Maybe for a new computer build on a specific tight budget. Reply
  • Arnulf - Tuesday, April 05, 2011 - link

    And 30+% the price. Why not go for the best price-performance at low overall price (which 6790 clearly isn't) when on extremely tight budget ? Reply
  • medi01 - Tuesday, April 05, 2011 - link

    Yet another round of "uhm", "oh", "but", "duh" about AMD product.
    In other news, we compare three 350$ AMD cards vs 3 500$ nVidia cards.

    Way to go, Anand.
    Reply
  • Mecavity - Tuesday, April 05, 2011 - link

    Oh, yay. Wouldn't be a proper article without someone complaining about an nVidia bias.

    A) The most expensive card included is an AMD...?
    B) The article is about a 150$ AMD card...? The case is being argued fairly, and the actual FOCUS is on comparing cards at the same level of pricing...?
    C) Critique works better if you state what you'd like to see included...?
    D) Derp.
    Reply
  • medi01 - Tuesday, April 05, 2011 - link

    The article is about 6790 and most of the conclusion page is about how 5830 sucks? (And how much did 5830 suck? Oh', they've dared to add more features while sacrificing a bit of performance and charge a bit more for it, how shameless... And this made it into the title of the product review. Pathetic.) Reply
  • strikeback03 - Tuesday, April 05, 2011 - link

    I noticed they gave this the exact same title they did for the 550Ti - "Coming up short at $150". And really the criticisms are the same - it is overpriced compared to both internal and external competition.

    How would you suggest they get excited over this? And how do you claim bias when one of the products they keep pointing to is the 6850?
    Reply
  • medi01 - Tuesday, April 05, 2011 - link

    Jesus Christ, AMD 3x350$ cards vs 3x500$ nVidia cards, where is bashing of the latter? (expensive, under performing and power hungry)

    How about if bashing, then bash both (who was there "duking out for performance king" eh?) if using softer words, then for all?

    Don't have balls to bash both anymore (stinky nVidia stories, *cough*)? DON'T BASH ANY!!!

    Oh, and last time I've checked, 460 was 160-200$ card (with MSRP 190$). And that was today.
    Reply
  • cknobman - Tuesday, April 05, 2011 - link

    I agree with ya.

    This article is focusing on the wrong things. Nvidia 460 768 MB is on the way out and has been publicly stated by Nvidia so that is going to leave a huge hole at $150 price point which is where the 6790 fits in. If you check out some of the other review sites the card performs pretty well (Anand your game library for benches sucks, HAWX - really? get with the times already!!!) plus the 6790 overclocks like a champ.

    Sure this is not the perfect $150 card but its most likely going to be the best there is in the immediate future.

    Im disappointed in this article.
    Reply

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