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Been occupied with i7 980X full review, but now I have got the base results out of the way, starting to do the memory side. My Dominator GT kit from old SKUs were 14+ months old from original first batches but it died half way into i7 980X review, so luckily I just got RMA #2 back from Kingston - first 2 kits were older Elpida J1108BASE-MNH-E Hyper which failed. This 3rd RMA replacement kit is new SKU KHX2000C8D3T1K3/6GX with most likely Elpida J1108BASE-MGH-E Hyper and it's the first X58 triple channel kit I've experienced capable of 7-7-7-x timings at >2000Mhz before only capable of 7-8-7-x timings.

To my surprise, this KHX2000C8D3T1K3/6GX kit is doing pretty well - here's my first 3hrs of trying 7-7-7-21 timings for the very first time >2000Mhz. Don't mind the slow Super Pi times due to using Windows 7 OS.


System:

• Intel Core i7 980X 3951A763 B1 Step 2 ES
• EK Supreme LT H20 + TFC480 + MCP655
• Asus P6T6 WS Revolution 0609 beta bios
• Sapphire HD5870 10.3 beta
• 6GB Kingston 2000C8 (KHX2000C8D3T1K3/6GX)
• 80GB Intel X25-M G2 SSD (OS)
• 120GB OCZ Vertex SSD (DATA)
• Pioneer DVR216 Burner
• Corsair HX1000
• Windows 7 Ultimate 64bit RTM (fully updated)

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DDR3-2124Mhz 7-7-7-21 1T at 1.76v

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DDR3-2160Mhz 7-7-7-21 1T at 1.78v

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DDR3-2191Mhz 7-7-7-21 1T at 1.78v

Not bad - will be interesting to see how much more head room there is

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Now testing KHX2000C8D3T1K3/6GX @ 6-6-6-20 1T timings, and to my surprise this kit is flying !

Memtest86+ v4.10 scaling:

• DDR3-1600Mhz 6-6-6-20 1T 1.4000v CPU VTT 1.66v VDIMM
• DDR3-1668Mhz 6-6-6-20 1T 1.4205v CPU VTT 1.66v VDIMM
• DDR3-1738Mhz 6-6-6-20 1T 1.4375v CPU VTT 1.66v VDIMM
• DDR3-1770Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.66v VDIMM
• DDR3-1820Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.70v VDIMM
• DDR3-1850Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.72v VDIMM
• DDR3-1858Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.72v VDIMM
• DDR3-1870Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.74v VDIMM
• DDR3-1880Mhz 6-6-6-20 1T 1.4750v CPU VTT 1.76v VDIMM

Windows max 32M Pi @DDR3-1850Mhz 6-6-6-20 1T, max 1M Pi @DDR3-1880Mhz 6-6-6-20 1T and validation @DDR3-1893Mhz 6-6-6-20 1T.

max 32M Pi @DDR3-1850Mhz 6-6-6-20 1T

max 1M Pi @DDR3-1880Mhz 6-6-6-20 1T

max validation @DDR3-1893Mhz 6-6-6-20 1T

CPU VTT = 1.50v
VDIMM = 1.76v





System:

• Intel Core i7 980X 3951A763 B1 Step 2 ES
• EK Supreme LT H20 + TFC480 + MCP655
• Asus P6T6 WS Revolution 0609 beta bios
• Sapphire HD5870 10.3 beta
• 6GB Kingston 2000C8 (KHX2000C8D3T1K3/6GX)
• 80GB Intel X25-M G2 SSD (OS)
• 120GB OCZ Vertex SSD (DATA)
• Pioneer DVR216 Burner
• Corsair HX1000
• Windows 7 Ultimate 64bit RTM (fully updated)

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Played with Win7 OS for a while, so back to XP Pro SP3 for some proper Super Pi 32M action

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Pushing the 6GB Kingston 2000C8 KHX2000C8D3T1K3/6GX kit to new personal best 7-7-7-21 timings mem frequency validation and max 32M Pi memory frequency. The resulting 32M Pi time ended up my 2nd fastest PB time just behind my W3520 + DFI UT X58-T3EH8 @4794Mhz H20 time of 7min 24.422s

Started off with a test run just at 3866Mhz with DDR3-2148Mhz 7-7-7-21 for testing efficiency for sub 9min cpu clocks.



Then pushed it to 4769Mhz with DDR3-2167Mhz 7-7-7-21 at 1.8v for 7min 24.937s. Very close to the limits of the voltages used and/or close to my max H20 cooled i7 980X Super Pi 32M stability or could be memory limit considering this KHX2000C8D3T1K3/6GX kit did DDR3-2160mhz 7-7-7-21 at 1.78v for 32M with same i7 980X.



Finally new PB for 7-7-7-21 at @DDR3-2235Mhz 7-7-7-21 at 1.8v





System:

• Intel Core i7 980X 3951A763 B1 Step 2 ES
• EK Supreme LT H20 + TFC480 + MCP655
• Asus P6T6 WS Revolution 0609 beta bios
• Sapphire HD5970 OC Edition 10.4 Official Catalyst Drivers
• 6GB Kingston 2000C8 (KHX2000C8D3T1K3/6GX)
• 750GB Samsung SATAII OS
• 120GB OCZ Vertex SSD (DATA)
• Pioneer DVR216 Burner
• Corsair HX1000
• WinXP Pro SP3 nlite + Windows 7 Ultimate 64bit RTM (fully updated) dual boot OS

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6GB Kingston 2000CAS8 KHX2000C8D3T1K3/6GX scaling tests, when I reduced the Uncore frequency multiplier from 24x to 23x - I reduced the Uncore frequency from 4128Mhz to 4071Mhz. I knew I'd get a potentially higher max memory clock at 8-8-8-24 1T timings, but was surprised by how much extra. I managed to jump from DDR3-2064Mhz to DDR3-2124Mhz at the same voltages of 1.45v CPU VTT and 1.66v VDIMM all thanks to Core i7 980X's lower minimum Uncore to Memory ratio requirements!

6GB Kingston 2000CAS8 KHX2000C8D3T1K3/6GX
@DDR3-2124Mhz 8-8-8-24 1T at 1.66v

• 23x 177bclk = 4071Mhz cpu frequency
• 23x 177bclk = 4071Mhz Uncore frequency (cpuz reports it as NB frequency)
• 18x 177bclk = 3186Mhz QPI frequency
• 12x 177bclk = DDR3-2124Mhz memory frequency

6GB Kingston 2000CAS8 KHX2000C8D3T1K3/6GX
@DDR3-2230Mhz 8-8-8-24 1T at 1.66v

Managing to use TurboV to push bclk incrementally until I reached DDR3-2230Mhz 8-8-8-24 1T at 1.45v CPU VTT and 1.66v VDIMM !

• 23x 186bclk = 4275Mhz cpu frequency
• 23x 186bclk = 4275Mhz Uncore frequency (cpuz reports it as NB frequency)
• 18x 186bclk = 3345Mhz QPI frequency
• 12x 186bclk = DDR3-2230Mhz memory frequency

6GB Kingston 2000CAS8 KHX2000C8D3T1K3/6GX
@DDR3-2184Mhz 8-8-8-24 1T at 1.66v

Next step was to drop the Uncore multiplier one more step from 23x to 22x. You'd think this would by default allow higher memory clocks, but it didn't. The reason being on Asus P6T6 WS Revolution, Uncore frequency is tied to Round Trip Latency (RTL) A/B/C channels and auto adjusts to tighter RTL values as you lower the Uncore multiplier. For further reading on this check out the info about optimal Uncore to DRAM memory ratios for Core i7 980X. Dropping Uncore multiplier from 23x to 22x with 12x memory multiplier resulted in RTL values being too tight around 56 for the memory frequency involved and resulted in system not booting.

So next step is to manually loosen RTL A/B/C channel values with Uncore multiplier dropped from 23x to 22x. I used a RTL delay on channels A/B/C of 9, which resulted in RTL values around 65 and higher being set which allowed windows to boot in and pass single Super Pi 32M run @DDR3-2184Mhz 8-8-8-24 1T at same 1.45v CPU VTT and 1.66v VDIMM ! And ended up max screenshot captured clocks at DDR3-2305Mhz 8-8-8-24 1T at same voltages.

• 23x 182bclk = 4186Mhz cpu frequency
• 22x 182bclk = 4014Mhz Uncore frequency (cpuz reports it as NB frequency)
• 18x 182bclk = 3276Mhz QPI frequency
• 12x 182bclk = DDR3-2184Mhz memory frequency

6GB Kingston 2000CAS8 KHX2000C8D3T1K3/6GX
@DDR3-2305Mhz 8-8-8-24 1T at 1.66v

• 23x 192bclk = 4418Mhz cpu frequency
• 22x 192bclk = 4226Mhz Uncore frequency (cpuz reports it as NB frequency)
• 18x 192bclk = 3457Mhz QPI frequency
• 12x 192bclk = DDR3-2305Mhz memory frequency

System:

• Intel Core i7 980X 3951A763 B1 Step 2 ES
• EK Supreme LT H20 + TFC480 + MCP655
• Asus P6T6 WS Revolution 0609 beta bios
• Sapphire HD5970 OC Edition 10.4 Official Catalyst Drivers
• 6GB Kingston 2000C8 (KHX2000C8D3T1K3/6GX)
• 750GB Samsung SATAII OS
• 120GB OCZ Vertex SSD (DATA)
• Pioneer DVR216 Burner
• Corsair HX1000
• WinXP Pro SP3 nlite + Windows 7 Ultimate 64bit RTM (fully updated) dual boot OS