Gigabyte GA-EX58-UD4P (Thanks to Gigabyte)
Intel i7 965 EX ES CPU (Due to ES Regulations, anonymous...Thanks!)
Intel i7 Xeon W3250 CPU (On loan from a friend for Max Blck testing, Thanks Kevin)
Crucial Ballistix Blue Tracer DDR3 1600Mhz (8-8-8-24) (Thanks to Crucial)
2 x Sapphire HD 3870 Toxic Edition 512MB
3 x Seagate ST3250410AS 250GB 7200 RPM HDD RAID 0
Ultra X3 850W 40312 PSU
Benchmarks results & programs used
HCI Design Memtest 3.6
Winrar Benchmark 3.8 (Alt + B to start for those who may be unaware)
Super PI / mod1.5 XS
RightMark Memory Analyzer 3.8
Benchmark results are provided at several speed ranges: 1600Mhz CAS 7, 1600Mhz CAS8, 1850Mhz, 1870Mhz and 1900Mhz.
Tests were performed for each of the following settings in a Gigabyte GA-EX58-UD4P motherboard. Each passed 8 hours or more of Memtest86+ 2.11, and each passed several hours of HCI Design’s Memtest running triple tests of 1024MB within windows while the system was in use. Along with that, each setting range was thoroughly put through various benchmark programs and tests, which are graphed below.
I am providing several sets of timings and voltages at various speeds for Gigabyte EX58 based boards at the end of this article. Each of the tables of settings that are provided below should be fully stable for you on the memory side of things, provided you have found the proper QPI/Vtt voltage settings for your CPU at the intended speed. If you have any issues, they would likely be due to other various settings, such as Uncore values, a incorrect QPI/Vtt voltage and/or QPI/Vtt / memory voltage relationship, or possibly IOH value not set properly per the speed or timings you are running. The settings provided are for starting stability, and are not fully tweaked.
Crucial has included an enthusiast certified XMP Profile at 8-8-8-24, as well as an extreme XMP Profile at 7-7-7-24. While I personally do not agree with the XMP programming design process as a whole, these profiles can be easily selected and used via your BIOS XMP Profile selection setting, should you decide to use them yourself.
QPI/Vtt voltage should not be a part of this programming design process, in my opinion. The i7 CPU's vary so widely that trying to use any given XMP setting could lead the end user to have major stability or booting issues, and even possibly end up thinking that the memory is faulty, and want to return it. All users should find their CPU's own specific QPI/Vtt voltage setting per the speed they are running, and based on what they have found their CPU to like in regards to the balance between the QPI/Vtt voltage and Dram voltage ratio.
For simplicity in helping others, these benchmarks and settings provided are using the 2:8 and 2:10 Memory multipliers. For the benchmark scores, I tried to keep the CPU Freq in the same area, but that's not always possible, as we all know. These results are solely based on the stable settings provided by the use of Auto for advanced timings, and are not tweaked at all.
Everest Ultimate Bandwidth
Everest Ultimate & RightMark Latency
RightMark Memory Bandwidth (Real Ram Maximal)
RightMark Read & Write Bandwidth
Highest memory speeds obtained within acceptable voltage and timing ranges.
Click images to view CPU-z validation pages
CAS 7-7-7-20 1673.8Mhz @ 2:8
CAS 8-8-8-24 1931Mhz @ 2:10 (Stock Specified Timings)
CAS 9-9-9-24 1980.08Mhz @ 2:10
Cas 9-9-9-24 2119.2Mhz @ 2:12
I was unfortunately unable to get in any maximum memory speed runs using this method, due to limited time and DICE. The max memory validations posted below were obtained on a water setup. Although, I do plan to have another DICE run shortly, so I may update this post with some results then, or just add them to the thread.
With this set of Crucial memory, I was able to reach one of my two highest CPU Blck frequencies, and was able to obtain one of my very first 5Ghz CPU-z validations.
Again, click to view validations.
237.05 Bclk with a ram speed of 1894.4Mhz at 888-20 timings
238.24 Bclk with a ram speed of 1906Mhz at 999-24 timings
5004.45 MHz with a ram speed of 1853.6Mhz at 999-24 timings