As part of today’s launch AMD released two new Kaveri based APUs as part of the FM2+ platform, the A10-7860K and the A6-7470K, as well as clarifying the way the new 125W Wraith stock cooler would be distributed at this time. What went under the radar almost was the release of a third part, the Athlon X4 845 CPU, featuring no integrated graphics but AMD’s newest architecture instead.

This makes good timing, because our review of AMD’s Carrizo, the mobile platform using the latest AMD architecture is set to go up in the next couple of days. AMD’s Excavator cores were the poignant part of AMD’s Tech Day in mid-2015, where the new Excavator architecture was discussed and especially in relation to the previous generation Steamroller cores.

The goal of Excavator, as we were told at the time, was to develop a series of big steps into improving the efficiency of the base Bulldozer microarchitecture through high density libraries, better metal stacks in production, more on-chip analysis to save power, more power planes to regulate those chances and everything in-between. We were told we wouldn’t see the Excavator core on the desktop in its desktop form because the design focused on the 15W-35W power window, rather than the 45W+ on the desktop.

Fast forward to today and there seems to be a slight reversal here. The new AMD Athlon X4 845 is a pair of Excavator modules in a desktop package, designed to slot right in where the Steamroller design through Kaveri has been sitting for a couple of years. Why the change? And why a single SKU at 65W, way off the 15W-35W range quoted as 'ideal' back at the Tech Day?

AMD Excavator Based Lineup
  A12 PRO-
8800B
FX-
8800P
A10-
8700P
A8-
8600P
A6-PRO
8500B
Athlon X4
845
Platform Mobile Mobile Mobile Mobile Mobile Desktop
Modules 2 2 2 2 1 2
Threads 4 4 4 4 2 4
Core Freq. (GHz) 2.1-3.4 2.1-3.4 1.8-3.2 1.6-3.0 1.6-3.0 3.5-3.8
Compute Units 4+8 4+8 4+6 4+6 2+4 4+0
Streaming
Processors
512 512 384 384 256 N/A
IGP Freq. (MHz) 800 800 800 720 800 N/A
TDP 15-35W 15-35W 15W 15W 15W 65W
DRAM
Frequency
2133 2133 2133 2133 1600 2133
L2 Cache 2x1MB 2x1MB 2x1MB 2x2MB 2x1MB 2x1MB

One thing that was made perfectly clear in AMD’s briefing on the new Athlon was that this is not a performance part – due to the nature of Excavator the new CPU would be purely an efficiency play, allowing customers to take advantage of the latest architecture in the desktop if they didn’t need the full-fat performance. Arguably you could already find Excavator in the desktop, through Dell’s Inspiron 3656 range which uses a mobile part in a desktop case with a discrete graphics card.

With the new Athlon, the fact that there is no graphics part to the FM2+ processor does raise several questions. Is this a new die specifically for the Excavator on desktop, which might run into the tens of millions of dollars to produce, or is it repurposed mobile silicon put into a desktop package. Instinct tells us it’s the latter, perhaps better binned parts to show that the core can do 3.8 GHz at 65W, but at the expense of the integrated graphics, or due to production issues the integrated graphics on die are unusable.  One of the interesting things is also the L2 cache situation, because the Excavator modules in Carrizo were designed with 1MB of L2 per module, rather than the 2MB of L2 cache per module in desktop Kaveri. This is somewhat balanced by the larger L1 data cache in Excavator, but because there is no L3 cache either, it has to rely on other Excavator enhancements (better prefetch, wider prefetch windows) in order to bring it up to speed.

The PCIe 3.0 lanes are also at x8, which is another mobile limitation rather than the result of the PCIe root complex being half-disabled.

AMD has already stated that the next generation of AMD APUs will be on the AM4 platform, code named Bristol Ridge and Summit Ridge. We assume Bristol Ridge to be Excavator based, because there has to be something between now and Zen, but it would seem to suggest that the Excavator memory controller has support for DDR3 and DDR4, similar to what was suggested when AMD announced their DDR4-capable R-series APUs for embedded late last year. This may mean that AM4 supports both DDR3 and DDR4 as a result, which would not be unsurprising given how most DRAM transitions go.

We have asked for samples when they start to circulate. The Athlon X4 845 will have a MSRP of $70.

Source: AMD

Additional, 3rd Feb: We have been told by AMD that 'The Athlon X4 845 is based on the "Carrizo" die with the GPU and FCH disabled. [T]he Athlon X4 845 supports DDR3 memory at speeds up to 2133MHz.'. Also, despite the focus on efficiency, the X4 845 will not have a configurable TDP.

POST A COMMENT

43 Comments

View All Comments

  • hojnikb - Tuesday, February 2, 2016 - link

    Zen is not exactly around the corner. I bet its at least a year away, at least as far as APUs are concerned (i'm sure iGPUless parts will come sooner): Reply
  • DanNeely - Tuesday, February 2, 2016 - link

    The timeline I saw was GPU only parts at the end of this year, APUs at some point next year. Reply
  • Alexvrb - Wednesday, February 3, 2016 - link

    There is no GPU-only Zen. That would be Polaris. :D

    If you mean CPU-only parts, that's essentially what he said... only he approached it from the other direction by saying "iGPUless". Zen FX late 2016, Zen APUs 2017.
    Reply
  • tipoo - Tuesday, February 2, 2016 - link

    The Athlon X4 845 at $70 might be the interesting piece here, I wonder if it will be able to knock off the i3 as the budget gaming champ. The current FX does ok with framerates,but not as well as the i3 at frame times. If the Excavator cores help with that, at 70, it could replace the trusty old i3+750TI as the "just better than console" combo for under $500 builds.

    With the money saved you could move up to a 950 with a more substantive impact on game quality, rather than moving to an i3 which still goes a bit moot if it pushes most games over 60fps.
    Reply
  • Oxford Guy - Tuesday, February 2, 2016 - link

    Cheaper to get a 7870 or something.

    https://www.techpowerup.com/reviews/EVGA/GTX_950_S...
    Reply
  • Bateluer - Tuesday, February 2, 2016 - link

    I find the X4 845 interesting. I've got an AM1 Athlon 5350 tower for playing with; based on the current prices for FM2+ boards and a 70 dollar 845, I could do a pretty big upgrade on that tower for ~120. Probably less. Reply
  • hojnikb - Tuesday, February 2, 2016 - link

    this athlon has no iGPU, so no good for your use case. Reply
  • Bateluer - Friday, February 5, 2016 - link

    I have an R7 360 in that box. Reply
  • Stuka87 - Tuesday, February 2, 2016 - link

    Why does the AMD slide show 95W, but then you guys say 65W? Reply
  • petteyg359 - Tuesday, February 2, 2016 - link

    It doesn't. It says "95W cooling solution". It still says 65W TDP. Reply

Log in

Don't have an account? Sign up now