AMD's Radeon HD 7970 gets reviewed

AMD has just pulled the tarp off its new AMD Radeon HD 7970 Southern Islands graphics card and we can finally unveil our thoughts on its brand new card and architecture.

It's the fastest single-GPU graphics card and also a graphics card of firsts.

The HD 7970 is the first GPU manufactured with 28nm transistors, is the first to support DirectX 11.1 (when that finally emerges) and the first to support PCI Express 3.0.

The first of these firsts is the biggy though and has allowed AMD to jam 4.3 billion of those 28nm transistors into the Tahiti XT graphics processor at its heart.

It also represents a new direction in graphics architecture for AMD, more in line with what Nvidia has been doing for years.

AMD is adamant it is no copycat though.

"From a purely technical point of view, the architecture that we've moved to is similar," says Mike Mantor, AMD Senior Fellow Architect. "On the GPU side though we've been investigating this scalar architecture for some time. We had good ideas how we'd go about it, what our gains would be and the cost of actually implementing it."

As well as being the fastest at stock clocks it's also one hell of a serious overclockers graphics card. We managed to push ours from 925MHz up to 1,125MHz.

The AMD Radeon HD 7970 is also rather expensive.

We don't have final UK prices yet but our best guess is around £450, with future overclocked versions coming in considerably more.

That's good news for Nvidia as it makes the impressive GTX 580 a far more reasonable proposition at just £365.

And talking of Nvidia, it's own new architecture, the Kepler-based graphics cards, will be available early Spring 2012. According to Nvidia insiders it's feeling quietly confident about its ability to compete with the Radeon HD 7970.

We've got a full, in-depth review of the AMD Radeon HD 7970 here.

Read more...

Testing Different Memory Speeds on AMD's A8-3850 Llano APU

Legit Processor Reviews

Memory Performance on AMD's A-Series APU

Last month Legit Reviews reviewed the AMD A8-3850 'Llano' APU and our article looks like it was well received by our readers with the exception of one thing.  We've had a number of readers write in saying that it was great that we tested this platform with 1866MHz memory, but they are building budget systems and want to use 1333MHz or 1600MHz memory. It is true that we didn't look at performance numbers of AMD's A-Series APUs on the A75 chipset at 1333MHz, 1600MHz and since this platform is very budget friendly we see this as a valid point.

Legit Reviews does not want to ostracize any of our readers and pride ourselves on our no-BS straight forward and honest reviews, so we went back to the drawing board to get you the performance data you need before ordering in a new platform. We'll be using the Gigabyte GA-A75-UD4H motherboard for testing again, but since we updated the BIOS to version F3 we re-did all of the performance numbers as we did see improved performance with the new BIOS.

We also got a few questions about how the platform handles 16GB of memory and if there are any stability issues with running all four memory slots fully populated. We've seen performance gains with all the memory slots full on AMD platforms in the past, so we'll be looking at 2x4GB and 4x4GB performance as well in our test results. Not too many people will be running 16GB of memory on the Llano A-Series APU, but we found no issues in doing so with G.Skill Ripjaws

So, to reiterate what our goals are for this article one more time:

• Benchmark 2x4GB memory kits at 1333MHz, 1600MHz, 1866MHz to find performance differences


• Benchmark 2x4GB versus 4x4GB to see if filling all the memory slots impacts performance


• See if we have any issues running 16GB of memory 

This should be easy enough, so let's take a look at the test system and get right to the performance numbers.

Next Page - The Test System

Read more...

AMD's Graphics Core Next Preview: AMD's New GPU, Architected For Compute

We’ve just returned from sunny Bellevue, Washington, where AMD held their first Fusion Developer Summit (AFDS). As with other technical conferences of this nature such as NVIDIA’s GTC and Intel’s IDF, AFDS is a chance for AMD to reach out to developers to prepare them for future products and to receive feedback in turn. While AMD can make powerful hardware it’s ultimately the software that runs on it that drives sales, so it’s important for them to reach out to developers to ensure that such software is being made.

While AFDS serves many purposes, the final purpose – and what is going to be most interesting to most outside observers – was to prepare developers for what’s coming down the pipe. AMD has big plans for the future and it’s important to get developers involved as soon as is reasonably possible so that they’re ready to use AMD’s future technologies when they launch. Over the next few days we’ll talk about a couple of different things AMD is working on, and today we’ll start with the first and most exciting project: AMD Graphics Core Next, AMD's next generation GPU architecture.

]]>

Read more...

The Brazos Update: AMD's E-450

At Computex there are a few systems floating around with an updated version of AMD's Brazos platform. The E-350 we reviewed not too long ago featured two Bobcat cores running at 1.6GHz alongside an 80 SP GPU running at 400MHz. Later this year AMD will refresh the platform with an E-450. You'll still get the same 2/80 core configuration, but clock speeds and memory support will be slightly different.

The E-450 runs at 1.65GHz, a mild increase over the E-350. Remember that AMD used a very GPU-like approach to the design of Bobcat. The chip was very easy to lay out and manufacture, but it doesn't have the frequency headroom of a traditional AMD CPU. Instead AMD will have to rely on process shrinks to really bring about larger increases in clock speed. AMD will also add DDR3-1600 support with the E-450, a mild spec bump over the 1333MHz support we get today.

While the GPU doesn't get any more execution power it will both operate at a higher base frequency and apparently support some form of graphics turbo. Manufacturers at the show tell us that the CPU side won't be able to turbo up. The E-450 is still a few months away from release, we'll see AMD's Llano followed by Bulldozer before Brazos gets this mid-cycle update.]]>

Read more...

AMD's Radeon HD 6990: The New Single Card King

The AMD Radeon HD 6990, otherwise known as Antilles, is a card we have been expecting for some time now. In what’s become a normal AMD fashion, when they first introduced the Radeon HD 6800 series back in October, they also provided a rough timeline for the rest of the high-end members of the family. Barts would be followed by Cayman (6950/6970), which would be followed by the dual-GPU Antilles (6990). Ultimately Cayman ended up being delayed some, and as a result so was Antilles.

So while we’ve had to wait longer than we anticipated for Antilles/6990, the wait has finally come to an end. Today AMD is launching their new flagship card, retiring the now venerable 5970 and replacing it with a new dual-GPU monster powered by AMD’s recently introduced VLIW4 design. Manufactured on the same 40nm process as the GPUs in the 5970, AMD has had to go to some interesting lengths to improve performance here. And as we’ll see, it’s going to be a doozy in more ways than one.

]]>

Read more...

The Brazos Review: AMD's E-350 Supplants ION for mini-ITX

AMD has been curiously absent from the value netbook and nettop segments since Atom’s arrival nearly three years ago. These markets are highly profitable only for component vendors, as the OEMs that sell netbooks and nettops must survive on very slim margins in order to hit aggressive price points. It wasn’t too long ago that we were shocked by $699 desktop PCs, but to now be able to get a fully functioning portable PC with display at below $300 is impressive. In order for the profit equation to work out however, you can’t simply scale down a larger chip - you need an architecture targeted specifically at the type of very light workloads you expect to encounter in these segments. Underclocking and undervolting an architecture targeted at high end desktops or servers won’t cut it.

Generally a single microprocessor architecture can cover an order of magnitude of power envelopes. You can take an architecture from 10W - 100W using clock speed, voltage scaling and disabling features (e.g. cutting cache sizes). You can’t efficiently take a 100W architecture and scale it down to 1W. Intel realized this with Atom, and what resulted was a new architecture designed to span the 0.5W - 5W range. Given the constraints of the process (Atom was built at 45nm) and a desire to keep die size down to a minimum (and thus maximize profits), Intel went with a dual-issue in-order architecture reminiscent of the old Pentium - but with a modern twist.

AMD came to the same realization. For it to compete in these value markets, AMD couldn’t rely on its existing Phenom II derived architectures. The Phenom II and its relatives currently span a range of TDPs from 9W to 140W, and at the lower end of that spectrum we’re talking about some very low clock speeds and performance targets. Getting down to 1W was out of the question without a separate design.

What AMD came up with was a core called Bobcat, initially targeted for netbooks, notebooks, nettops and entry level desktops. Architecturally Bobcat is a significant step ahead of Atom: while still dual-issue, it features an out-of-order execution engine making it the Pentium Pro to Atom’s Pentium.

It isn’t just CPU architecture that AMD surpassed Atom with, the first incarnation of Bobcat is an integrated SoC with on-die DirectX 11 GPU. AMD calls this combination a Fusion APU (Accelerated Processing Unit) as it places both a CPU and GPU on a single die. Read on for our full review of AMD's first Fusion part: the E-350.

]]>

Read more...

What a Day: AMD's CEO Dirk Meyer Resigns

I don’t usually pay much attention to corporate executives and the hirings, firings and resignations thereof. It’s not that executives are unimportant, it’s that they’re not exactly what I’m passionate about. While I never pass up an opportunity to meet with an exec, I generally walk away more impressed after a conversation with a Fellow.

 

Today’s resignation of AMD’s former CEO Dirk Meyer seemed like reason to pay attention. It wasn’t a scandal or anything vile that led up to the resignation, just a good old fashioned differing of opinion. To quote AMD’s press release:

”However, the Board believes we have the opportunity to create increased shareholder value over time. This will require the company to have significant growth, establish market leadership and generate superior financial returns. We believe a change in leadership at this time will accelerate the company’s ability to accomplish these objectives.”

The implication being that Dirk’s plan for AMD wouldn’t result in significant growth, establish market leadership and generate superior financial returns. The question is what was Dirk’s plan and what direction does AMD’s Board of Directors believe it should be headed in instead?

]]>

Read more...