AMD Athlon 64 & Athlon 64 FX - It's Judgment Day
by Anand Lal Shimpi on September 23, 2003 1:25 PM EST- Posted in
- CPUs
AMD's Gem: Athlon 64
When you have an architecture that has been talked about publicly for a couple of years and when all of your partners have had access to CPUs for almost as long, it becomes very tough to keep things a secret. Leaks occur and it would be an understatement to say that AMD was plagued by a few leaks, so most of the information you're about to hear has been published elsewhere and already alluded to.
With that said, AMD has brought two versions of their K8 architecture to the desktop market - branded the Athlon 64 and the Athlon 64 FX. The Athlon 64 is the 754-pin ClawHammer that we've been hearing about all this time, while the Athlon 64 FX is little more than a higher clocked 940-pin Opteron.
Let's start with the regular Athlon 64; contrary to surprisingly popular belief, the regular Athlon 64 does include an on-die memory controller - what it doesn't include is the on-die 128-bit memory controller found on the Opteron. Instead, you will find only a single-channel 64-bit memory controller with the Athlon 64. This on-die memory controller supports regular unbuffered DDR SDRAM at speeds of up to DDR400.
The other major difference between the Athlon 64 and the Opteron is that the Athlon 64 only has a single Hyper Transport link. Remember that the K8 architecture does not have any external "Front Side Bus" instead, serial Hyper Transport links connect the CPU to external chips such as a South Bridge, AGP controller or another CPU. With only one Hyper Transport link, there's no hope for the Athlon 64 to be used in multiprocessor environments as the sole Hyper Transport link would be tied up by the South Bridge/AGP controller. This lack of multiprocessor support is in direct contrast to the "lack" of multiprocessor support with the Athlon XP, which you could use in multiprocessor configurations; with the Athlon 64 it is physically impossible (unless you don't want any BIOS, hard drive or expansion slot support).
AMD originally announced that the Athlon 64 would have a 512KB L2 cache, however after continued delays and increased competition the Athlon 64 was given a full 1MB L2 cache. As we mentioned before, the 128KB L1 cache remains unchanged from the original Athlon XP and its exclusive nature means that the Athlon 64 has a total of 1088KB of cache for data storage (the remaining 64KB is for instruction storage).
The Athlon 64 will continue with AMD's model numbering system, although with a revised test suite. The end result is that AMD is much more conservative with their ratings, meaning that an Athlon 64 3200+ is inherently faster than an Athlon XP 3200+, despite carrying the same model number. As you've undoubtedly heard, the only Athlon 64 available at launch will be the 3200+, which will run at a 2.0GHz clock speed. The 2.0GHz clock speed is arrived at by taking the 200MHz Hyper Transport clock and multiplying it by a 10.0x clock multiplier. Currently there isn't a way to adjust the multiplier of Athlon 64 CPUs, so the potential for overclocking exists by increasing the Hyper Transport clock.
In Q4 AMD will launch the Athlon 64 3400+, which we'd assume would be clocked at 2.2GHz. The 3400+ will be the last Athlon 64 for 2003, and although we will see lower clocked versions in the mobile space, that will be it for desktops. The 3400+ will be introduced at around $600.
The Athlon 64 3200+ will sell for $417 in 1,000 unit quantities.
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Anonymous User - Tuesday, September 23, 2003 - link
Anyone know how the new AMD CPU compares to the Apple G5? I am not an Mac-Apple guy, but my in-laws are, and I'd like to be in the know in case we get into a friendly "discussion" about the Windows and Mac platforms.Anonymous User - Tuesday, September 23, 2003 - link
#58 Fanbois? lolAnonymous User - Tuesday, September 23, 2003 - link
This review appears to be in the same general lines as the rest of the Opteron/Pentium comparisons; I'm pleased that AMD has managed to shore up their shortcomings, but the price point is what's keeping me away from going directly from a pre-XP AMD Athlon to Athlon64. If I spend $400+ on a processor, it better be the king of the hill for the next year at least, or at least the mobo should be upgradeable to compensate for CPU obsolesence.And I'm surprised no one's figured out how to unlock Opteron multipliers yet, since that's basically the heart of the early-day AXP overclocking scene... Bridge blowing, soldering, "wire mods", etc. Shame, shame on you overclocking enthusiasts for not throwing everything into unlocking the hottest new processor (figuratively, not literally; Prescott and P4EE take that award at 103W and 150W, respectively). :P Talk about good wholesome fun, take an Opteron at 3.4GHz (using multipliers) and slap that Zalman Cu-7000 thing on it; a Pen-what?
#58: No, there are dumber fanboys than Intel fanboys, trust me. Just visit Something Awful. :/
Anonymous User - Tuesday, September 23, 2003 - link
intel fanbois rank among the top percentile of dumbest fanboi's on the internet.Anonymous User - Tuesday, September 23, 2003 - link
Is AMD actually planning on selling these versions of the 64? They and the hardware will be obsolete the day they are purchased. THe two biggest advantages the chip has can't even be used yet. The new mobos can't handle any more Ram than the current Pentium boards, I thought being able to use more ram was one of the selling points of the 64? Although that point seems to be moot anyway until a new 64 bit os is out.Anonymous User - Tuesday, September 23, 2003 - link
#36 You're right dude. Intel indeed said that prescott 3.2 GHz can't touch the performance of the 3.2 GHz P4EE. Logical actually, since prescott has no extra L3 cache, and a longer pipeline. The only benefits are: larger L1 cache, larger L2 cache and SSE-3 (only needed for sysmark-2004 LOL!, and other intel benchmarketing partners)Anonymous User - Tuesday, September 23, 2003 - link
Anagram for Intel Fanboy - INANE BOTFLYAnonymous User - Tuesday, September 23, 2003 - link
THG review: triple-guaranteed bullshit. Anandtech review: Infidel profane pagan loutish review. Ace's Hardware review: For great justice!11Anonymous User - Tuesday, September 23, 2003 - link
original pentium 66 was pants got beat by a 486original pentium 4 was just as bad
give it 6 months for the chip to mature. hopefully the athlon64 is a success cause if amd go bust we all pay double for cpus
Anonymous User - Tuesday, September 23, 2003 - link
There's some confusion on using the term 32bit and x86 here. I believe what was mean in response to what #32 said, is that A64 runs x86 natively the same way a XP does with no emulation, (as was outlined in previous Anandtech articles) just by disabling half of the 64-bit registers. So it had better run at least as well as the Athlon XP/P4 or there is something seriously wrong... not something to brag about.#50, For an Intel fanboy you sure don't know your history. Using 386 would be more appropriate as that was the change from 16-bit to 32-bit... and things have not fundamentally changed in the instruction set since then.