How does AMD respond to Lynnfield? Is it by drastically cutting prices on Phenom II? Nope. By introducing the world’s first quad-core processor to debut at $99. Now that’s cool.

It’s called the Athlon II X4 and its existence shouldn’t be any surprise. AMD quietly announced it along with the Athlon II X2 line.

Today we get two models: the Athlon II X4 630 and the Athlon II X4 620, priced at $122 and $99 respectively. The only difference between the two is clock speed; the 630 runs at 2.8GHz while the 620 runs at 2.6GHz. These are both AM3 chips meaning they'll work in AM3 motherboards with DDR3 memory or AM2+ boards with DDR2 memory.

Processor Clock Speed L2 Cache L3 Cache TDP Price
AMD Phenom II X4 965 BE 3.4GHz 2MB 6MB 140W $245
AMD Phenom II X4 955 BE 3.2GHz 2MB 6MB 125W $245
AMD Phenom II X4 945 3.0GHz 2MB 6MB 125W $225
AMD Phenom II X3 720 BE 2.8GHz 1.5MB 6MB 95W $145
AMD Phenom II X2 550 BE 3.1GHz 1MB 6MB 80W $105
AMD Athlon II X4 630 2.8GHz 2MB 0MB 95W $122
AMD Athlon II X4 620 2.6GHz 2MB 0MB 95W $99
AMD Athlon II X2 250 3.0GHz 2MB 0MB 65W $87

This isn’t a harvested Phenom II nor is it a pair of Athlon II X2s, instead it looks like we have a brand new die on our hands (some Athlon II X4s will be crippled Phenom IIs but AMD insists that the new die will be used). The Athlon II X4 has four cores on a single die, but unlike the Athlon II X2 each core only has a 512KB L2 per core. You can tell by the die shot that the core-to-cache ratio is much higher than on the X2:

The 45nm Athlon II X4 Propus die

The 45nm Athlon II X2 die (note the larger L2 per core)

Like the rest of the Athlon II lineup there is no L3 cache. This helps keep the die small (and affordable) but also hurts performance:

Processor SYSMark 2007 Overall E-Learning Video Creation Productivity 3D
AMD Phenom II X4 920 (2.8GHz) 173 151 212 167 167
AMD Athlon II X4 630 (2.8GHz) 157 128 221 131 162
% of Phenom II X4 91% 85% 104% 78% 97%


At the same clock speed the Athlon II X4 should offer roughly 90% of the performance of a Phenom II X4.

Processor Cores Manufacturing Process L1 Cache L2 Cache L3 Cache Die Size Transistor Count
AMD Phenom II X4 4 45nm 128KB per core 512KB per core 6MB 258 mm2 758M
AMD Athlon II X4 4 45nm 128KB per core 512KB per core 0MB 169 mm2 300M
AMD Athlon II X2 2 45nm 128KB per core 1MB per core 0MB 117 mm2 234M
Intel Core 2 Quad Q8xxx 4 45nm 64KB per core 4MB 0MB 164 mm2 456M


The price is unbeatable. If we ignore the 630 for a moment, the Athlon II X4 620 is by far the cheapest route to four cores on the market. Intel’s most affordable quad-core is the Core 2 Quad Q8200 at $163, while AMD would previously charge you $163 for a Phenom X4 9600B. This is where the AM3/AM2+ compatibility play really helps out. Motherboard/memory costs are as cheap as possible thanks to AMD's incredible socket flexibility.

And just in case you’re wondering, yes, the Athlon II X4 620 actually delivers performance competitive with the Q8200 but for 60% of the cost. It’s not all that clear cut, there are some cases where the 620 is faster but others where the Q8200 is much faster. On average it ends up being a wash but you’ll want to pay attention to the coming pages to see how the cookie crumbles as it does vary from test to test.

Codename Propus

Overclocking isn't unfortunately as good as the Phenom IIs; the result of a conscious design decision or simply the early nature of the Propus die. That being said, without a single extra millivolt I was able to hit 3.25GHz on my Athlon II X4 620 sample - making it even more valuable. Extra voltage proved mostly useless, I could only approach 3.4GHz with an extra 300mV.

Let’s see, have I thoroughly ruined the surprise? Check. Now let’s get to the tests.

The Test

Motherboard: Intel DX58SO (Intel X58)
Intel DX48BT2 (Intel X48)
Gigabyte GA-MA790FX-UD5P (AMD 790FX)
Chipset: Intel X48
Intel X58
Chipset Drivers: Intel (Intel)
AMD Catalyst 8.12
Hard Disk: Intel X25-M SSD (80GB)
Memory: Qimonda DDR3-1066 4 x 1GB (7-7-7-20)
Corsair DDR3-1333 4 x 1GB (7-7-7-20)
Patriot Viper DDR3-1333 2 x 2GB (7-7-7-20)
Video Card: eVGA GeForce GTX 280
Video Drivers: NVIDIA ForceWare 180.43 (Vista64)
NVIDIA ForceWare 178.24 (Vista32)
Desktop Resolution: 1920 x 1200
OS: Windows Vista Ultimate 32-bit (for SYSMark)
Windows Vista Ultimate 64-bit
SYSMark 2007 Performance
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  • silverblue - Wednesday, September 16, 2009 - link

    Sure, AMD has been forced to realise that competing at the higher end is a worthless exercise thanks to Lynnfield, however they've had Propus on their roadmap for a year now so I'd hardly term it "Emergency Edition". It's not a clock-speed bump like a certain Emergency Edition we all remember (how much did the various P4 EEs cost again?).

    With AMD providing a more complete platform, and especially one that allows for easy upgrades, the new Athlon II X4s could work for them in that it'll be cheap to upgrade from the old Athlon X2s as well as relatively inexpensive to build a new setup with CPU/motherboard/RAM (remember the onboard Radeon still runs rings around any Intel IGP). I doubt that i5/i7 sales make up most of their current order book (hell, they're still advertising Core2 on television and in IT publications here in the UK) so, like with graphics cards, the majority of the money stands to be made from mainstream and value products. As someone said before, this could be great for OEMs to improve their margins, as well as AMD if it means more bundles are sold. What's more, as things get more multi-threaded, dual cores fall more and more below the curve.

    I'm interested in seeing what Intel does, and even though their market share has grown again this quarter, I don't believe they can just do nothing about the Athlon II X4. Generally, below $150 or so, AMD does offer better performance for the price, even if, per clock, an Intel chip does more (and it's not always down to Intel-specific optimisations either) and earns its maker more money.
  • silverblue - Wednesday, September 16, 2009 - link

    Slight clarification on the P4 EE; it wasn't just a clock speed bump (3.2GHz -> 3.46GHz -> 3.73GHz) as, for example, the FSB was increased with the 3.46GHz model to 1066MT/s, then the core changed from Gallatin to Prescott (inc. extra cache) for the 3.73GHz model.

    Don't want anyone to think I just picked on the P4 EE just because it was fashionable or anything :)
  • Ratman6161 - Wednesday, September 16, 2009 - link

    Microcenter is advertising a special on the i5 750 at $159. But even at the full $206 suggested retail, if you are really doing something that benefits from 4 cores, it doesn't really make sense to me to go with anything less. There are even 1166 motherboards for just over $100 so the $99 quad just isn't saving enough to make it worthwhile.
  • gstrickler - Wednesday, September 16, 2009 - link

    On page 6 of the review the Excel Monte Carlo Simulation test shows the Q8200 (2.33GHz) being faster than the Q8400 (2.66Ghz)

    Same thing happens again on page 7 on the WinRAR Archive Creation test.

    You didn't mention it in the text and it's very unlike you to overlook or fail to comment on such an odd result.
  • flipmode - Wednesday, September 16, 2009 - link

    you said
    Overclocking suffers a bit as the chips capable of the highest clocks are destined to be Phenom IIs.

    And I think this does not make any sense. These are probably manufactured on their own wafers, and they are not Deneb dice, but completely different dice, so regardless of the clockspeed that any individual die is capable of, it cannot become a Phenom 2.
  • Anand Lal Shimpi - Wednesday, September 16, 2009 - link

    You're quite right :) I clarified in the article. That would apply to rebadged Denebs, but as to why the Propus core doesn't clock so well it's not totally clear to me at this point.

    It could be a design decision or just the impact of manufacturing a brand new die or just a bad sample.

    Note that I could get the chip a lot higher but it wasn't stable by my definition :)

    Take care,
  • gstrickler - Wednesday, September 16, 2009 - link

    It's not overclocking. These chips are rated to run at "turbo" speed indefinitely. Each of the 4 cores is capable of running at that speed. However, for power and thermal management of all 4 cores, the on chip power management "underclocks" the cores dynamically depending upon load to keep the combination of all active cores from exceeding thermal and power limits.

    Intel is being very honest in listing the speed as the slowest speed at which all 4 cores can run concurrently, even though they're all rated to run 1.5x bus multiplier steps faster. The difference between the slowest "underclock" and "turbo" mode on the upcoming Core i7 mobile chips is reported to be much more than 1.5x (~6x). Again, that's for power (mostly) and thermal management, allowing it to operate as a fast single/dual-core or slower tri/quad core depending upon current usage.

    The reality is that most software can't currently take advantage of more than 1 or 2 cores, and for those applications, you're going to get the benefits of turbo mode. When you're running tasks that can benefit from 3 or 4 cores, the cores reduce their clock to limit the power and heat, giving lower performance on each thread, but higher total throughput.

    The user gets the benefits of a fast dual core and a slower quad core, depending upon current load. Because all of that power management is handled by the PM on the CPU, it's transparent to the OS.
  • The0ne - Wednesday, September 16, 2009 - link

    I see many angry users concern about the term overclocking. It strikes me hilarious that people really claim to know what Intel is and/or have actually done with their chip.

    I too agree it is not a fair comparison because the Turbo mode does increases the frequency. Granted that this is a feature of the chip itself but that is a feature that is not present on the AMD and hence isn't a apples to apples comparison. If you're going to represent Intel with a 600MHGhz boost why not compare it to a regular clocked AMD and an AMD chip that is clocked around the same turbo-boosted speed. That would be a fair comparison and would give anyone a clearer picture.

    The reason why the arguments by most of the users here are hilarious to me is that I don't think they have a clue to how the CPU's were tested. We have had CPU's that were generally locked to keep the speed/price ration. This "feature" was not presented as a feature to the consumer but once the market found out the chip could actually provide more then they in a sense enabled it. So the difference here now is is that Intel is making this available, unlocked and calling it a feature and suddenly cries of joy and stupidity are abound. Yes, yes, the technology isn't entirely the same but the end result is.

    Do you seriously think Intel did not overstress test their chips and fool-heartily tested only at stock. Do you think they didn't test them in turbo mode and still continue until the chip died? I can't recount the 30 years on my engineering career not having to test products in the extreme range of just about anything (temp, vibration, shock, emc, drop, shipping, customer use, etc.). If you are an engineer and don't do this you shouldn't be selling your shtty product, end of conversation. Feel free to disagree and be laugh at by the industry.

    Having said of of this the simple matter is that if Intel's feature is boosting the clock by 600, then why not compare an AMD chip with similarly clocked speed? And further more, why do you even rant about having to do this in the first place? Getting caught up in this "overclocking" terminology and not looking beyond what stands to reason is ignorant. At the very least I would hope to see the lower price Intel I5/I7 compare with the competition in default and turbo modes. Why wouldn't YOU?

    Flame away,
  • Ratman6161 - Wednesday, September 16, 2009 - link

    Weather its overclocking or not, leaving the turbo feature on the i5 makes it a good comparison for those people who want to just plug in the chip and run it within its specs. You are comparing "out of the box" speed of one versus the other. It doesn't make sense for every one, but I think the article gave enough information for the knowledgeable reader to make their own decisions.
  • pervisanathema - Wednesday, September 16, 2009 - link

    How can anyone advocate intentionally crippling the superior product in order to make the comparison more favorable for the competition? That's like a car magazine intetionally removing the turbo from a factory turbo charged vehicle so "that would be a fair comparison and would give anyone a clearer picture."

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