AMD's Radeon HD 6450: UVD3 Meets The HTPCby Ryan Smith on April 7, 2011 12:01 AM EST
AMD’s Northern Islands family is composed of four GPUs, roughly divided into two categories. At the top is the 6900 series powered by Cayman, AMD’s first VLIW4 GPU. Below Cayman are three more GPUs, all derived from the VLIW5 Evergreen generation(5000 series). The first of these GPUs was Barts, which is the basis of the 6800 series that launched back in October of 2010. However up until now we haven’t seen the other two mystery GPUs in the retail market. Today that starts to change.
The final two Northern Island GPUs are Caicos and Turks. They have been available in the OEM market for both desktop and mobile products since the beginning of the year, but as is often common with low-end/high-volume GPUs, a retail presence comes last instead of first. AMD is finally giving Caicos its first retail presence today; it will be powering the new Radeon HD 6450. Packing all the upgrades we saw with Barts last year, it will effectively be replacing the Radeon HD 5450. But how well does AMD’s latest stand up in the crowded low-end market? Let’s find out.
|AMD Radeon HD 5670||AMD Radeon HD 5570||AMD Radeon HD 6450 (GDDR5)||AMD Radeon HD 5450|
|Memory Clock||1000MHz (4000MHz data rate) GDDR5||900MHz (1800MHz data rate) DDR3||900MHz (3.6GHz data rate) GDDR5||800MHz (1600MHz data rate) DDR3|
|Memory Bus Width||128-bit||128-bit||64-bit||64-bit|
|VRAM||1GB / 512MB||1GB||512MB||1GB / 512MB|
|Manufacturing Process||TSMC 40nm||TSMC 40nm||TSMC 40nm||TSMC 40nm|
Although it’s likely redundant to say that the GPU market is on a constant forward march in performance, it’s a very prudent analogy when discussing the Radeon HD 6450. With the launch of a new generation of integrated GPUs from both Intel and AMD in the last few months, the tail-end of the line took a big step forward and now everything else must move forward to keep pace. AMD’s previous low-end product, the 80SP Radeon HD 5450, is effectively matched by Intel’s HD 3000; meanwhile you can get as many SPs in an AMD Zacate APU, although performance isn’t quite enough to catch the 5450. Regardless, when iGPUs can deliver the performance of the lowest-end dGPU, a new low-end dGPU is required. This is Caicos.
At the lower end of the GPU market we’re accustomed to seeing a very large gap between the lowest GPU and the next model higher; with the 5000 series it was the difference between the 80SP Cedar and the 400SP Redwood GPUs. The performance drop-off is quite severe, but it’s what’s necessary to make a GPU small enough and cheap enough to meet the needs of the extreme budget segment of the market. Thus while the latest generation of iGPUs requires AMD to produce a faster low-end GPU, they still need to keep it cheap enough for the market, and as such there won’t be a radical overhaul.
At the end of the day Caicos and the Radeon HD 6450 it’s based on are a larger version of the 5450 with Barts’ technology improvements. Coming from the 5450 AMD has doubled the SIMD count from one SIMD to two, doubling the number of SPs from 80 to 160. Meanwhile the number of texture units per SIMD has decreased from eight per SIMD to four per SIMD, resulting in the same eight texture units, but now split between the two SIMDs. This is now consistent with the rest of AMD's lineup, as Cedar/5450 had twice as many texture units in its 1 SIMD as other 5000/6000 parts normally have per SIMD.
The ROP side of the equation has not been changed however, pairing the 160SP compute core with the same set of four ROPs we saw on the 5450. What has changed on the ROP/memory side is support for GDDR5; while we will see DDR3 6450 cards too, AMD is more or less using GDDR5 from top to bottom now. For the GDDR5 6450 the core clock is 750MHz and the memory clock is 900MHz (3.6GHz data rate), so not only does the 6450 have more SIMDs than the 5450, but it’s clocked faster by 100MHz and has over twice the memory bandwidth too.
These changes give it a major leg-up on the 5450 while still keeping the GPU size manageable. The transistor count and die size has gone up as one would expect; the 5450 was 292M transistors for a die size of 59mm2, while the 6450 is 370M transistors at 67mm2. So the 6450 will likely cost more for AMD to produce, but only marginally so. TDP has also gone up from 6.4W at idle and 19W at load to 9W at idle and 27W at load, mostly due to the higher power consumption of GDDR5. 27W is still easily handled by passive coolers, and we should see a number of both actively and passively cooled cards.
AMD has put the MSRP of the 6450 at $55. This will cover both the 512MB GDDR5 and 1GB DDR3 varieties. Pricing of low-end cards rarely toes the line, so expect prices to be all over the place. At $55 the market is quite packed, so AMD’s competition is going to include the 5450, the 5550/5570, the GT 220, and even a few budget-priced GT 430 cards. A few of these cards are going to be quite a bit faster than the 6450—ultimately the economic advantage of a small GPU is more present in high-volume OEM sales than it is in retail sales.
In any case, the one thorn in the side of the 6450 is that it’s a soft launch. While all of our data is applicable to the existing similar OEM cards, retail cards won’t be showing up until the 19th. Honestly we’re a bit confused as to why AMD is soft launching the 6450 given that it doesn’t have any immediate competition—the more insidious reasons usually attached to a soft launch are that it’s to keep potential customers from buying a competitor’s product, but it’s not as if NVIDIA has recently launched a similar product. Anyhow, your guess is as good as ours, but it’s unfortunate to see AMD doing a soft launch after doing so well in the mid-range and high-end markets this year.
|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|
|$50-$70||Radeon HD 5570|
|$55||Radeon HD 6450|
|$30-$50||Radeon HD 5450|
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lukechip - Thursday, April 7, 2011 - linkIn the April 2011 Video Card MSRP list, you've omitted the Radeon HD 6950 2GB. Given that this was the first 6950, and in my mind, the 'real' 6950, why is it not listed ?
Ryan Smith - Thursday, April 7, 2011 - linkThe MSRP list isn't mean to be a definitive list of every card at every price point; but still, that was a rather silly omission. I've since added it.
ImSpartacus - Thursday, April 7, 2011 - linkAlso missed the GTX 590, but I understand that the purpose of the chart was to show the 6450's position, not to be completely and ultimately definitive.
Ryan Smith - Thursday, April 7, 2011 - linkNo, that would be because I'm an idiot.
The chart was taken from the GTX 550 Ti article, which predated the 590 (which is why it's not there).
GeorgeH - Thursday, April 7, 2011 - linkThis might be a great HTPC card for an existing box, but unless AMD has seriously screwed up I can't see this card being terribly attractive for much of anything once Llano ships.
ImSpartacus - Thursday, April 7, 2011 - linkI would've liked to see some discussion on that topic. Llano will probably be pitiful on the CPU end, but if they can cram a strong GPU into the product, these $50 GPUs will eventually become extinct.
starfalcon - Thursday, April 7, 2011 - linkI suppose with Llano and Ivy Bridge, discrete graphics for HTPC use will essentially be extinct.
For gaming I wonder if they will be willing to release any low end graphics that can be beaten by IGPs, if not, then I wonder what the lowest end cards they will release will be.
vol7ron - Thursday, April 7, 2011 - linkI agree, unless they will be used in other ways. I'm not sure what max resolution IGPs can support. Also, I'm sure if you use the HTPC as more of a PC than HT, you will probably need the additional parallel processing (or dedicated GPU).
All-in-all these cards remind me of dedicated cards from the 90s :)
starfalcon - Friday, April 8, 2011 - linkI know IGPs can do 2560x1600.
With Sandy Bridge I think it only can do it with display port but besides that 1920x1200 with HDMI/DVI. Shouldn't be a problem.
What will you need the additional parallel processing for?
Or dedicated GPU?
Sandy Bridge supports quick sync and Llano should have lots of processing capabilities, Ivy Bridge should have more and more stuff also.
vol7ron - Sunday, April 10, 2011 - linkSay you're playing a game, want to put it on pause and watch some TV, or have multiple display setups and want to watch TV while playing a game. Add a DVR capture card and you'll be need more CPU and GPU processing.
I'm just not sure how great the performance would be. Especially assuming you wanted to attach this to a 46"+ display. It might be "capable", but we all know that word is very misleading and quality is hard define when you don't see it with your own eyes.