Two weeks ago we saw the paper launch of the Radeon HD 6450, the low-end member of AMD’s Northern Islands family of GPUs. It was a solid product for HTPC use and a very notable improvement over the 5450 it replaced, but it was an uncharacteristically delayed launch for AMD. At the same time we noted that the Northern Islands family had one more GPU we had not seen: Turks.

As it turns out, Turks-based video cards will be launching alongside the 6450 today, delivering all of the remaining Northern Islands products in a single push. Turks will be powering the Radeon HD 6670 and Radeon HD 6570, replacing the Redwood-based Radeon HD 5670 and Radeon HD 5570 respectively. Considering that we saw AMD deliver a solid update for their low-end lineup with the 6450, will we see the same with Turks and the 6670/6570? Let’s find out.

  AMD Radeon HD 6670 AMD Radeon HD 5670 AMD Radeon HD 6570 (GDDR5) AMD Radeon HD 5570
Stream Processors 480 400 480 400
Texture Units 24 20 24 20
ROPs 8 8 8 8
Core Clock 800MHz 775MHz 650MHz 650Mhz
Memory Clock 1GHz (4GHz data rate) GDDR5 1GHz (4GHz data rate) GDDR5 1GHz (4GHz data rate) GDDR5 900MHz (1800MHz data rate) DDR3
Memory Bus Width 128-bit 128-bit 128-bit 128-bit
VRAM 1GB 1GB / 512MB 512MB 1GB
FP64 N/A N/A N/A N/A
Transistor Count 716M 627M 716M 627M
TDP 66W 61W 60W 42.7W
Manufacturing Process TSMC 40nm TSMC 40nm TSMC 40nm TSMC 40nm
Price Point $99 $65-$85 $79 $50-$70

Turks is the 4th and final member of the Northern Islands family, or to be more practical the 3rd and final member of the revised Evergreen family. Based on Redwood before it, Turks implements the Northern Islands series’ architectural improvements while also implementing a larger number of SIMDs in order to give AMD a mid-cycle performance boost on the same TSMC 40nm process.  With the 6450 dragging up the low-end of the market and competitive pressure from NVIDIA, AMD needed a product above the 5670 but still smaller/cheaper than the 5750, and that is what Turks will provide.

Architecturally, Turks is very close to Redwood. Compared to Redwood it has 6 SIMDs instead of 5 SIMDs, giving it 480 SPs and 24 texture units versus 400 SPs and 20 texture units on Redwood. The ROP count remains unchanged at 8 ROPs, while the memory bus is still 128 bits wide. Of course being a Northern Islands GPU, Turks implements all of the common improvements we see with NI: UVD3, improved texture filtering, HDMI 1.4a (e.g. Blu-Ray 3D), a revised tessellation unit, and DisplayPort 1.2 support.

These improvements have of course added some bulk to the die; Redwood was comprised of 627 million transistors while Turks is 716M. This in turn has increased the die size slightly to 118mm2, coming from 104mm2 on Redwood. Power consumption has also gone up accordingly, but less so than the transistor count or die size did. For the 6670 the TDP is 66W, versus 60W for the 5670. The 6570 GDDR5 meanwhile is rated for 60W versus 43W for the 5570; this is largely a consequence of switching to GDDR5. Meanwhile idle power consumption is 10W for the 6570 DDR3, 11W for the 6570 GDDR5, and 12W for the 6670.

As far as performance is concerned, the 6670 is close to the 5670 on paper. At 800MHz the 6670 has a 25MHz (3%) core clock advantage, while the 1GHz (4GHz data rate) memory clock is identical to the 5670. The big advantages for the 6670 are any gains in architectural efficiency, combined with the additional SIMD; the SIMD alone gives the 6670 a 20% shading and texturing improvement over the 5670. With the same 8 ROPs between the two cards, the 6670 should excel in shading and texturing bound situations, while ROP or memory bandwidth bound situations will be much closer.

Top: Radeon HD 6670. Bottom: Radeon HD 6570

For the 6570 on the other hand, the performance advantage is quite a bit larger. The original 5570 – and the one we continue to test today – launched with DDR3 memory. AMD did introduce a GDDR5 variant in the summer of 2010, but it never gained much traction. So compared to the 5570, the GDDR5 6570 with its 1GHz (4GHz data rate) GDDR5 has 222% the memory bandwidth of the DDR3 5570 and its 900MHz (1.8GHz data rate) RAM. Now there’s a catch in all of this: similar to how the 5570 ended up, AMD will be launching cards with both GDDR5 and DDR3. The GDDR5 cards like the one we’re reviewing today will come with 512MB of RAM, while the DDR3 cards will come with 1GB of RAM. The extra RAM has its advantages in some edge cases, but our advice always has been and remains to be that you should pick the GDDR5 versions of most video cards over the (G)DDR3 versions. The only notable downside to the GDDR5 card in this case is that GDDR5’s power consumption is much higher, which is why the GDDR5 6570 is a 60W card while the DDR3 6570 is 44W.

RAM aside, the 6570 has the same advantages over the 5570 as the 6670 has over the 6570. With identical core clocks of 650MHz, the performance difference comes down to the RAM, followed by the 20% increase in the SIMD count. The GDDR5 6570 should outperform the DDR3 5570 by quite a bit at all times, but it’s going to absolutely shine in memory bandwidth or shader-bound situations, while anything that’s ROP-bound will be closer.

AMD will be launching the 6670 at $99 and the 6570 at $79, putting both cards right in the middle of the highly-competitive sub-$100 market. Competing cards include the Radeon HD 5670, the frequently discounted to $99 Radeon HD 5770, the similarly discounted GeForce GTS 450, and the GeForce GT 440 – a higher clocked GF108 (GT 430) part with GDDR5 that NVIDIA quietly released back in February. As was the case with the 6450 and most other sub-$100 launches, without a die shrink new parts cannot compete with discounted parts from a higher tier, so it shouldn’t come as a surprise that the 6670 in particular is easily beaten on performance at $99.

Thankfully unlike the 6450, the 6670 and 6570 are hard launching today. They will be appearing at e-tailers later today alongside the 6450.

April 2011 Video Card MSRPs
$700 Radeon HD 6990
$320 Radeon HD 6970
  $260 Radeon HD 6950 2GB
$240 Radeon HD 6950 1GB
  $200 Radeon HD 6870
$160 Radeon HD 6850
$150 Radeon HD 6790
  $110 Radeon HD 5770
  $99 Radeon HD 6670
  $79 Radeon HD 6570
$50-$70 Radeon HD 5570
$55 Radeon HD 6450
$30-$50 Radeon HD 5450


Meet The Radeon HD 6670 & Radeon HD 6570


View All Comments

  • Ryan Smith - Tuesday, April 19, 2011 - link

    Yes, they do. So does the 6450, which is why I suspect 6450 is going to be the best HTPC card for most people. Reply
  • SteelCity1981 - Tuesday, April 19, 2011 - link

    I got a 5670 and the 10% increase in performance isn't worth me spening an extra 100+ dollars on a 6670. See what AMD has in stores with the Radeon 7 series. Reply
  • tomoyo - Tuesday, April 19, 2011 - link

    Yep, it's not for anyone with a current 5xxx. For me, I may go for this card because I want something low power for htpc + casual gaming, and it should be silence-able as well with the low idle power usage. Also hdmi will be nice with audio when connecting to tvs :) Reply
  • G-Man - Tuesday, April 19, 2011 - link


    Are there any plans to do articles where you "revisit" old conclusions and see if they still hold true? Like for Radeon 5670, it wasn't priced well at launch and suffered for it in the review, but after price cuts it's pretty much recommended everywhere in the price segment. It's often hard to understand exactly what Anandtech recommends at the moment, as opposed to at launch.

  • tomoyo - Tuesday, April 19, 2011 - link

    Sounds like one of the only useful things from tomshardware, the video card price guide. I'd say you could always look there if you want to know the best current price/performance cards. Reply
  • 789427 - Wednesday, April 20, 2011 - link

    Ding, Ding...
    I enjoy both sites as both provide me with news and different perspectives but Mr Smith, kindly refrain from bad-mouthing your colleagues.

    Let me provide you some insight that seems to refute Anandtech and Tomshardware *shared* claims about the latest and best in graphics...

    Both sites focussed on noise as being the decision criteria for adopting one top end card over the other. Availability is more pertinent in the case of the high end cards.

    To focus on noise as the deal-breaker seemed quite moot when Nvidia doesn't intend shipping 590 cards in volume.

    Furthermore, a reference design at this level is simply a speed showcase - I don't for a second think that the majority of cards will be sold based on the reference design but at this level, manufacturers will listen to their client's desires (or to the noise the card actually makes and make some changes;))

    In this particular instance, I was amazed at how much your opinions overlapped.

    The reason that I've gone to such lengths with this particular example is to highlight what the most useful thing about Anandtech and Toms actually is - a difference of opinion that better highlights the truth often shaded by opinions and preconceptions.

    Your comment above should seriously be reconsidered as I believe that as a genre, both sites have actually contributed to each other's success far more than any individual, including yourself, has.

    My 2c.

    Finally, about the cards... I find both fill a market. new purchasers of 1080 screen non-gamers will be satisfied with the lower offering and people that just want good performance without changing PSUs, heating a room and generally want good bang for the buck. How many people pay MSRP online? So the launch price tends to be higher... Just state the price that you'd recommend it and save us from reading the same old comments over again...

    So, the 5750 is going to become an outmode as soon as the 7 series is out. and there are cards to replace it that are cheaper to make and run cooler. Not quite news but good to see in the flesh. Wasn't the real story of the 6 series that AMD finally got crossfire to scale right? ah well...
  • Soulkeeper - Tuesday, April 19, 2011 - link

    I'd like to see the stats tables include the memory bandwidth so I don't have to calculate it myself each time I read one of these.

  • AstroGuardian - Thursday, April 21, 2011 - link

    +1 Reply
  • Arnulf - Tuesday, April 19, 2011 - link

    This not only goes to show how much hardware has improved over time but it also gives owners of older cards, perhaps with a rattling fan or some other issues, plenty of incentive to upgrade. My X1950Pro gave up on me recently so I went for Vapor-X version of HD5770. New card is virtually silent compared to that old beast.

    Keep up this practice and consider including comparable models from BOTH manufacturers ! :)
  • vavutsikarios - Tuesday, April 19, 2011 - link

    There are 2 things I want to say, both a bit sideways the topic.

    First, about the paperlaunched 6450, I dont get it. The card is for sale, retail, at various shops here 2 weeks now. Doesnt look like a paperlaunch from where I stand, and this is not the most central part of the world (i live in greece)

    Second, and more important, there is an upcoming game I d like to see in reviews. I am talking about might and magic heroes 6, scheduled to launch on June 23.
    There is an interesting twist about it, most probably. I mean, if the game is anything like its predecessors, its going to be much more useful as a CPU than as a GPU benchmark. I mean, you can easily play a turn based strategy while on 15-20 fps. They are enough. But when I run the 6 years old heroes 5, with all the graphics details on high, no problem there, I still have to wait for the AI to complete their turn. The game is CPU limited SIX YEARS after it was released!!

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