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[Anand]Hands-on with Nehalem and x58

post #1 of 9
Thread Starter 
Quote:
We had an early opportunity to "play" with a Bloomfield CPU and X58 board yesterday. Our first impressions are quite positive based upon a quick run through of several major benchmarks. Our particular CPU sample was running at 2.93GHz and initial performance in video/audio applications was simply superb. The board design and BIOS were just finalized for qualification testing so it is too early to tell just how well this platform will eventually perform. There has been a lot of speculation about Intel limiting overclocking and we do not have a final answer yet if this is true.

On our platform that featured triple channel DDR3, the processor multiplier was locked at 22 with a QPI bus setting of 133 to generate the 2.93Ghz CPU speed. Memory was running at DDR3-1066 with ratios available for 1333, 1600, and 1866. Due to the early BIOS revision, memory was only stable at 1066 in triple channel DDR3 operation but we were told 1333 memory speeds should be available shortly. Intel will allow a Turbo mode that increases the CPU multiplier to 23 and that was all our board/BIOS combo was capable of yesterday. We could not raise the QPI bus speed past 140 without incurring stability problems.

The board manufacturers informed us they are working on ways to increase the CPU multiplier past the single Turbo speed step and that QPI bus speeds should improve greatly once BIOS tuning is completed. While we wanted to provide clarification to the overclocking question, it is just too early to tell what the enthusiast can expect in the way of overclocking at this time. We will follow up later this week with some additional information after we have more time with the platform.
http://anandtech.com/weblog/showpost.aspx?i=456
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post #2 of 9
nice... overclocking is going to get alot harder thou
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post #3 of 9
I don't think so, not any harder than AMD at any rate. This is just an early revision, with an early mobo and beta BIOS.. No wonder it's being touchy.
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post #4 of 9
Quote:
Originally Posted by bowman View Post
I don't think so, not any harder than AMD at any rate. This is just an early revision, with an early mobo and beta BIOS.. No wonder it's being touchy.
Intel will also be very selective of what you can or cannot do. One small issue here at Computex could hurt the products image later on when it is released.
    
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post #5 of 9
Quote:
Originally Posted by bowman View Post
I don't think so, not any harder than AMD at any rate. This is just an early revision, with an early mobo and beta BIOS.. No wonder it's being touchy.
ya this should make amd look really easy to tweak with
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post #6 of 9
opinion with held until Intel and Nvidia get over them selfs...
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good enough
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post #7 of 9
Thread Starter 
I posted this in another Nehalem thread. This covers the clock in Nehalem and how overclocking might work.
Quote:
However, we do know a considerable amount about the clock and power domains of AMD's native quad-core Phenom CPU's which have many elements in common with Nehalem. Barcelona/Phenom, has three primary clock domains all based off of a common reference clock... one for the cores, one for the L3 cache and memory controller, and one for the HyperTransport Link. This design provides for maximum flexibility in managing power efficiency and performance.

By combining what has been reported to date about Nehalem's clock and power structure, and leveraging what we know about AMD's native quad-core product, we can draw some reasonable conclusions about the design of Nehalem.


Reference Clock: The diagram above illustrates that like Phenom, Nehelam will leverage a reference clock. This reference clock will provide a stable clock signal to all CPU and bus driven components in the system with individual clock domains. Adjusting this clock up or down will affect all other clocks in the system. Expect the reference clock frequency to be some multiple of 33Mhz to start such as 200MHz, 233MHz, etc. (The Phenom reference clock is 200MHz).

Core Clocks: To support EDAT, Nehalem must support individual core clock multipliers to throttle core clocks up and down in relation to load and power profiles. Whether these individual multipliers will be accessible through BIOS is completely unknown. It's very probable that only a base core multi will be exposed to users and the individual core clocks will not be user accessible. Expect the base core multiplier to be in the range of 6 to 16 and upward locked on non-Extreme processors.

Overclocking Example
If overclocking Nehalem is anything like overclocking an AMD Phenom native-quad core, here's what you can expect for a possible stock Bloomfield processor:
  • Reference Clock: 200MHz
  • Core Clock: Default Multi = x16 (16 x 200Mhz = 3.2GHz)
  • L3/IMC Clock: Default Multi = x10 (10 x 200MHz = 2GHz)
  • QuickPath Clock: Default Multi = x16 (16 x 200MHz = 3.2GHz)
  • Memory Bus Clock: Default Ratio based on SPD
To Overclock with a non-Extreme Processor you would need to increase the reference clock and possibly dial-back the multipliers on the non core elements as follows:
  • Reference Clock: 266MHz (66MHz overclock)
  • Core Clock: 16 x 266MHz = 4.256GHz (use default multi for aggressive overclock)
  • L3/IMC Clock: 8 x 266MHz = 2.128GHz (lower multi for a mild overclock)
  • QuickPath Clock: 12 x 266MHz - 3.192GHz (lower multi to maintain stock freq.)
  • Memory Bus Clock: Select ratio to suit RAM overclock
http://www.nehalemnews.com/2008/05/e...r-domains.html
maybe I should've just made a thread about it.
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post #8 of 9
Isn't Bloomfield the one we've been expecting to be overclockable because it's the more expensive one. What about the lower end one like Lynnfield? That's the one I'm interested in overclocking because it won't cost $1000+
    
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post #9 of 9
Saying that LGA1366 will be just $1000+ Extreme Editions is patently ridiculous, even though that's the rumor many sites like to cite again and again. It's a socket shared by servers, workstations, and desktops. There will in all likelihood be reasonably priced Xeons for it just like there are for LGA775 and LGA771 now, if not reasonably priced 'Core 3' CPUs.
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