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PC Update Final piece of the puzzle

PC Update Final piece of the puzzle

Over-clocking the Ageing CPU was the final stage required to bring my ageing gaming rig up to 2015 specification.

Original post here: http://mindbendingpuzzles.blogspot.ie/2014/11/extending-life-of-my-gaming-pc.htmlhttp://mindbendingpuzzles.blogspot.ie/2014/11/extending-life-of-my-gaming-pc.html

Earlier trials had proven my i5-760 had plenty of over-clocking headroom while maintaining stability but that the stock Intel heat-sink was unable to dissipate the additional heat generated. A Zalman CPS10X  heatsink addressed that problem for a modest �26 additional investment.

Zero points for neat cabling but at least the airways are clear.

I had taken  measurements well and fitting the large heatsink posed no real problems although it took a while because I had to remove the motherboard to fit a rear retaining plate. The i5-760 has a factory locked multiplier so over-clocking is a trade-off that requires adjustments to cpu, ram and IMC voltages and timings. I used the utilities that came with my ASUS motherboard to get a ballpark position before manually tweaking. In the end I settled for a rock solid 25% over-clock that keeps the peak CPU temperature below 79�C under severe torture testing and to the mid 60s during actual heavy gaming. My i5 now runs at a nominal 3.6GHz but this isnt directly comparable to a modern 3.6GHz processor because of the older architecture. Nevertheless it should serve me well enough for the next years gaming. 3D Mark Fire-strike score for the final rig is 8,717 which is less than 5% below their modern "High End Gaming PC" benchmark. The rig runs Assassins Creed Unity smoothly as butter in high quality mode with Vsync at 60 frames per second. I got the game free with my GTX 970 graphics card and it looks absolutely gorgeous. It is probably the most beautiful game I have ever seen.

An interesting side story: Modern CPUs vary their internal clock rate and disable cores depending on temperature and load. In order to test over-clocking it is normal  to disable these energy saving features while doing stability and thermal testing. Once I determined that my CPU ran stably  within acceptable temperature limits at 3.6GHz.  I went back into the bios to re-enable these  features in order to avail of the energy saving benefits. On rebooting I was quite surprised to see that the processor was now running at 4.1 GHz rather than 3.6GHz??? It seems that my efforts had also enabled turbo mode which over-clocks the processor when less than half of the four cores are in use. I was worried that this would invalidate my careful stability tests but further torture testing didnt show up any glitches and I decided to leave it as is.

Here for reference is a full list of the before and after in my project to bring a five year old gaming PC up to 2015 standard with a budget of only �400.

Component	Before	After	Cost of Upgrade
Processor	I5-760  2.9GHz /3.3GHz	I5-760 3.6GHz/4.1GHz	�26 for new Heatsink
Ram	4Gb  x 1333MHz	8Gb x 1666MHz	�25 for extra 4Gb
SSD	-	64Gb SSD Cache drive	�39 for SSD �24 for Software
Graphics Card	Radeon HD 5850	Inno3  Nvidia GTX 970	�310
Total Cost of parts			�424

Note 2: For an estimate of US equivalent prices just take the euro figures as US $. Our high sales tax pretty much cancels out the euro dollar exchange rate.

A little over my �400 budget but I should recoup the difference by selling my HD 5850 and the bulk of the investment will still be useful in a new build next year. The GTX 970 should be good for two years at least. I intend to keep using the SSD cache as long as I still use large spinning HDDs. Even the heatsink may be useful on a new motherboard. Only the ram is almost certain to be obsolete.

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