AMD's Quad FX: Technically Quad Core
by Anand Lal Shimpi on November 30, 2006 1:16 PM EST- Posted in
- CPUs
Power Consumption
Power consumption of a Quad FX system is simply unreal for a desktop, as it should be because this is effectively a workstation platform with un-buffered memory. At idle our Quad FX test bed consumed nearly 400W, partially because we couldn't get Cool 'n Quiet running on the system, but also because the CPUs and motherboard simply draw an incredible amount of power. Update: We got Cool 'n Quiet working on the motherboard which reduced idle power significantly, down to within a few watts of the Kentsfield system. Load power was unchanged.
| CPU | Idle Power | Load Power | Performance per Watt (fps/watt) |
| AMD Athlon 64 FX-74 (3.0GHz x 4) | 217W | 456W | 17.7 |
| Intel Core 2 Extreme QX6700 (2.66GHz x 4) | 213W | 263W | 32.9 |
Looking at power consumption under full load, Cool 'n Quiet would have no chance to even make an impact as all cores are being utilized at full speed. Under load the Quad FX system pulled 456W on average, a full 73% more than our Kentsfield testbed.
If we look at performance per watt, the Quad FX loses big time. We specifically chose to look at our WME encoding test because the performance of the FX-74 and QX6700 is pretty close. What you're looking at here is the best case scenario for the Quad FX's performance per watt; in applications where it's significantly slower than Kentsfield the performance per watt will be even worse.
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peternelson - Thursday, November 30, 2006 - link
I image www.Scan.co.uk in the UK will stock both boards and cpus at realistic street pricing.
And I am seriously thinking of getting one, to put lots of PCIe cards into, and for use WITH A NUMA AWARE OPERATING SYSTEM.
Who knows, Asus may even release a bios upgrade for it!
And also note that there is a similar Asus "Deluxe" board not just the WS workstation variant, so may be a little cheaper.
My other options are a dual socket Opteron board (with expensive memory) or a Core2Quad, using Nvidia 680i chipset which gives less I/O capacity.
Anonymous Freak - Friday, December 1, 2006 - link
Or, you could go for a dual socket Xeon system. It would cost near the same, and you'd have the option of two quad-core processors RIGHT NOW. (Rather than late next year.)Of course, then you run into more expensive (and more power-hungry) memory. But if you are actually looking at such a system, a Xeon might be a better fit.
mino - Friday, December 1, 2006 - link
The problem IS the memory and I/O, these are the strenghts of this solution.Prices of cheap 4C WS solutions:
HIGHEST PERFORMANCE 4C: -> systems have comparable performance (Vista/XPx64 in account)
-------------------------------------------------
***Quad FX:
1pc FX-74 $1000
1pc MB $350
4pcs 1G RAM $400
1pc Fortron PSU $100
0pcs 8-port SATA controller $0
----------------
Total: $1750
***Core 2 Quad:
1pc QX6700 $1000
1pc MB $250
4pcs 1G RAM $400
1pc Fortron PSU $60
1pc 8-port SATA controller $150
---------------
Total: $1860
BEST VALUE 4C: -> systems have comparable performance[except QX6700] (Vista/XPx64 in account)
-------------------------------------------------
***Quad FX:
1pc FX-70 $600
1pc MB $350
4pcs 1G RAM $400
1pc Fortron PSU $100
0pcs 8-port SATA controller $0
----------------
Total: $1350
***Core 2 Quad:
1pc QX6700 $1000
1pc MB $250
4pcs 1G RAM $400
1pc Fortron PSU $60
1pc 8-port SATA controller $150
---------------
Total: $1860
***Opteron 2000:
2pcs 2216 $1200
1pc MB $400
4pcs 1G RAM $600
1pc Fortron PSU $100
1pc 8-port SATA controller $150
---------------
Total: $2450
***Xeon 5100:
2pcs 5150 $1200
1pc MB $400
4pcs 1G RAM $700
1pc Fortron PSU $100
1pc 8-port SATA controller $150
---------------
Total: $2550
IDEAL WS/PC Solution: (best value proposition, upgrade possible when necessary)
----------------------------------------------
1/2pcs FX-70 $300
1pc MB $350
2pcs 1G RAM $200
1pc Fortron PSU $60
0pcs 8-port SATA controller $0
---------------
Total: $910
The funny thing beeing, the biggest value of QuadFX is in the exceptional motherboard. Except those those 10 not routed USB ports, that board is a dream come true.
And yes, those 12 SATA3G ports would be a blessing for my storage needs...
peternelson - Friday, December 1, 2006 - link
Nice costings, I'm thinking the same here.
That board has lots of I/O bandwidth.
Since the Gbit ether ports support teaming (2 muxed together), I would have thought it worthwhile for Asus to implement all four rather than two.
Four used separately would make nice routing between lans, and four used as two teamed pairs would give > 1Gbps performance in and out eg as a firewall, or as a server with redundant connection, or to talk to NAS boxes etc. Two extra nets wouldn't push the power consumption up by much.
Hopefully Asus (or other) will produce a rev2 board with the extra ethernets.
Lonyo - Thursday, November 30, 2006 - link
There's support for 14 USB ports AFAIK, 4 on the back, and 5 headers on the mobo, which makes 14 I think, which still isn't 20, but it's more than enough, and it's more than 10 :P
mino - Friday, December 1, 2006 - link
No, those 2 headers are for IEEE1394...SLIM - Thursday, November 30, 2006 - link
Is this just a prelim review only talking about the processors and the real review is still to come? I mean the only reason for this platform to exist is the 4 GPUs not the cpus. Let's see 4 8800gtx's with the FX74s playing at insane resolutions in games that intel simply can't fathom due to the lack of support for 4 gpus (at least as far as I know of).The 4 gpus are the point of this platform, not power consumption, not 3dsmax... GAMES WITH 4 GPUS! I don't mean to be too abrupt, but the boards got 4 graphics slots for a reason.
Spoelie - Friday, December 1, 2006 - link
A single 8800gtx is already being bottlenecked by a core 2, let alone them in SLI.Quad SLI will not have any performance advantage over SLI, as the processing power to feed them is just not there.
PrinceGaz - Thursday, November 30, 2006 - link
I dread to think what the power consumption of a system with the FX-74s and four 8800GTX cards would be. It would probably be close to 1KW, possibly even around 1100W or so. That would be insane!JarredWalton - Thursday, November 30, 2006 - link
Given that this "4x4" initiative is apparently going to use NVIDIA graphics cards, and NVIDIA makes both AMD and Intel chipsets, if they decide to do anything with quad G80 chips you can pretty much guarantee that it will be for both platforms. Thus, 4x4 is really 2x2 right now, whereas the 775 platform is 1x4 and Xeon is 2x4. In the future, AMD will have 2x4, and perhaps all the platforms will support some silly quad GPU configuration.Basically, quad SLI was all about the pissing contest. "Oh yeah, well I have for GPUs and you only have two!" Then there was the completely bogus marketing material that they sent out with quad SLI talking about how great the extra GPUs would be for accelerating physics calculations. I suppose it's possible that in the future such applications will become useful, but almost a year after the initial talk of NVIDIA physics acceleration and we have yet to see any actual demonstration of this capability. Anyway, this Quad FX is just the same thing as Quad SLI: potentially good marketing, but lackluster final performance and terrible heat and power requirements.