Power Consumption

Given that AMD reduced power consumption a bit alongside the move to Socket-AM2, we wanted to see how the new chips compared to the latest CPUs AMD had sent us prior to the launch. So we pitted our last Socket-939 sample, the Athlon 64 FX-60, against the two new Socket-AM2 samples we just received: the Athlon 64 FX-62 and the X2 5000+. Remember that the FX-62 actually carries a 125W TDP rating, so it shouldn't be any cooler than previous CPUs, but the X2 5000+ is a new 89W part.

There are inevitably going to be power differences between the Socket-AM2 and Socket-939 motherboards we used, but unfortunately there was no way to isolate them from the comparison as we are measuring total system power consumption.

System Level Power Consumption at Idle

System Level Power Consumption under Full Load

Under full load, the X2 5000+ does appear to be a bit cooler than the Socket-939 FX-60. We've seen in the past that the 1MB vs. 512KB of cache doesn't really result in any significant difference in power consumption, so it looks like the overall decrease in power consumption is because of the improvements in production AMD has implemented at Fab 30. It is worth noting that the Pentium Extreme Edition 965 consumes just as much power as the FX-62, thanks to its 65nm manufacturing process. Even so, we still can't wait for Intel to drive its power consumption levels even lower later this year.

The Odd Multiplier Issue Final Words
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  • MacGuffin - Tuesday, May 23, 2006 - link

    From Patriot's PDC22G8000+XBLK Rev. 2 review on PCSTATS.
    Rated for DDR2-667 @ 3-3-3-9 (Maintains those timings through DDR2-940!)
    Rated for DDR2-1000 @ 4-4-4-12 (Goes Up to DDR2-1020!)
    Completely stable on the Intel platform they used. It's extremely expensive (saw it for $400+ at NewEgg). But yes, it is possible to run 2GB at these timings already. Its just extremely expensive.
    Reply
  • EdisonStarfire - Tuesday, May 23, 2006 - link

    any opinions on AMD offering a Clearspeed solution as stop-gap in the high end desktop arena ? Reply
  • Griswold - Tuesday, May 23, 2006 - link

    The bottom line is, we now know what we knew last fall, or rather (rightfully) assumed.

    quote:

    AMD does have one last trick up its sleeve before the end of the year, and you will hear about it in June. It's not K8L and it's not going to affect the majority of people, but it is an interesting stop gap solution for the high end in 2006...


    Now you made me curious. Could that be the "noise in june" which Henri Richards mentioned in a Register interview earlier this month?

    Reply
  • smn198 - Wednesday, May 24, 2006 - link

    It is called quad-core. Reply
  • temp2 - Tuesday, May 23, 2006 - link


    The extremetech.com article has a similar teaser at the end, but it is slightly more specific:

    "And given recent discussions with AMD, we can safely say that the company hasn't launched its last FX series CPU for the year quite yet."
    Reply
  • mino - Wednesday, May 24, 2006 - link

    This provided, 3.2 or even 3.4 FX's on 65nm are on the way... Reply
  • Scrogneugneu - Tuesday, May 23, 2006 - link

    Beware the mighty Sempron FX 32 ! Reply
  • mino - Tuesday, May 23, 2006 - link

    2 options:
    1) Quad-core K8 (on 65nm)
    2) High-speed 65nm DC's(improbable)

    BTW what I understand FX-64 is on the way in a few months(july-august). Seems rev. F cores could handle 3.0, just 125W TDP may be the issue.
    Reply
  • peternelson - Tuesday, May 23, 2006 - link


    Well, I don't think it's a QUAD CORE K8 (aka "Deerhound") because that is not due until late 2007.

    And dualcore K8L is not until 1H/2007.

    We need to choose something happening THIS year.
    Reply
  • mino - Wednesday, May 24, 2006 - link

    Actually AMD can made Quad-core CPU's even on 90nm if they need to. The core will be huge, yields poor but IMHO 2.2G Quad at 90nm is possible within 125W TDP.

    Also AFAIK AMD has delayed 65nm at least for a quarter intentionally since what they need now is capacity on 90nm. They could not afford any (even short-term) production reduction at this moment. Provided in 3Q/06 FAB 36 is up and running at 10k starts the could afford to dedicate some of them for some high-end opterons and FX's.
    Reply

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