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Intel Clarkdale CPU Overclocking With IGP Enabled - Reaching High BCLK
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Intel Clarkdale CPU Overclocking With IGP Enabled - Reaching High BCLK
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2nd February 2010, 09:27
| #1 |
| Madshrimp  Join Date: May 2002 Location: 7090/Belgium
Posts: 79,021
 |  Intel Clarkdale CPU Overclocking With IGP Enabled - Reaching High BCLK Since the launch of the new CPUs from Intel, nicknamed Clarkdale, we have seen a fair share of overclocking attempts; some people even breaking world records, pushing the a Clarkdale over 7Ghz. We have read reports from overclockers who had issues with pushing the BCLK higher when the IGP was enabled. In this article we will explore possible solutions to help circumvent this limit, so you can enjoy high BCLK while using the IGP. http://www.madshrimps.be/gotoartik.php?articID=988
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2nd February 2010, 09:34
| #2 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
 | Attaching the screenshots of the "721MHz frequency testing". Warning ... a lot!
__________________  Last edited by Massman : 2nd February 2010 at 09:36. |
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2nd February 2010, 16:45
| #3 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| As far as I can understand how the IGP frequency is made, the IGPbase frequency is not function of BCLK, but of BCLK/4. So: IGPbase = 133*multiplier/4 or IGPbase = 33*multiplier. The multiplier itself is one value ... officially.
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2nd February 2010, 20:59
| #4 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| Straight from Intel datasheet: //edit: added second one.
__________________ Last edited by Massman : 10th February 2010 at 09:09. |
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2nd February 2010, 21:39
| #5 |
| [M] Reviewer  Join Date: Nov 2004
Posts: 4,127
  | 011000binary makes 24decimal, 24x33 gives 800  |
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3rd February 2010, 09:49
| #6 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| It seems that the clock frequency of the Intel GMA can vary between 166MHz and 900MHz. For desktop CPU's, that's 733 and 900 only, for mobile the igp frequency is automatically decreased when turbo mode is enabled and you're running high load CPU applications. So: 166 = 33 x 5 = 000101b 200 = 33 x 6 = 000110b 233 = 33 x 7 = 000111b 266 = 33 x 8 = 001000b 300 = 33 x 9 = 001001b 333 = 33 x 10 = 001010b 366 = 33 x 11 = 001011b 400 = 33 x 12 = 001100b 433 = 33 x 13 = 001101b 466 = 33 x 14 = 001110b 500 = 33 x 15 = 001111b 533 = 33 x 16 = 010000b 566 = 33 x 17 = 010001b 600 = 33 x 18 = 010010b 633 = 33 x 19 = 010011b 666 = 33 x 20 = 010100b 700 = 33 x 21 = 010101b 733 = 33 x 22 = 010110b - DESKTOP 766 = 33 x 23 = 010111b 800 = 33 x 24 = 011000b 833 = 33 x 25 = 011001b 866 = 33 x 26 = 011010b 900 = 33 x 27 = 011011b - DESKTOP
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3rd February 2010, 11:41
| #7 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| IGPclk = IGPbase x (BCLKset / 133) MHz Now: IGPbase = (BCLKset / 4) x IGPmp Thus: IGPclk = (BCLKset / 4) x IGPmp x (BCLKset / 133) MHz Or: IGPclk = (BCLKset² x IGPmp) / 533 MHz That looks weird 
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3rd February 2010, 15:01
| #8 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| When looking a the desktop datasheets, I'm a bit confused, though.
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5th February 2010, 14:27
| #9 |
| [M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| A bit more testing: 100MHz and 200MHz BCLK: 1200 * (100/133) = 902MHz 600 * (200/133) = 902MHz Performance: 5525 vs 5435
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5th February 2010, 16:28
| #10 |
| [M] Reviewer Join Date: Nov 2004
Posts: 4,127
| Don't make clock dividers over-complicated  PS home tomorrow? |
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