MB OC Report :: EVGA nForce 790i SLI FTW Digital PWM
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October 17, 2008, 10:22 AM
Hardware Canucks Reviewer
Join Date: Mar 2007
Location: Edmonton, AB
First Course Continued: 2x2GB Memory Clocking
We will now focus on a 2GB kit of memory that absolutely tore it up on the 790i Ultra, a kit of
Mushkin Ascent 2x2GB PC3-12800 CL7
. After seeing the 2x1GB kit held back by the SPP, it will be interesting to see if these 2x2gb modules struggle at the higher clocks. Keep in mind, this kit ran up to and over DDR3-2000 dual 32M at 8-7-6 fairly easily. Here is a repeat of the setup used in testing:
CPU: Intel C2D E8400 (L808A476)
CPU Cooling: Thermalright Ultra-120
RAM: Mushkin Ascent 2x2GB PC3-128000 CL7
NB Cooling: Stock
SB Cooling: Stock
PWM Cooling: Stock
GPU: HIS HD3870X2
PSU: Thermaltake Pure Power 750W
HD: Seagate SATAII 80GB 8MB NCQ
OS: Windows XP Pro x64 SP2 (fully updated)
Before we see any results, here is a quick look at the setup which is un-changed from the FSB Out of the Box clocking section.
The setup as tested...
click for full size...
With no SPP volt mod or additional cooling to the chipset, we saw 2x1GB clocks being limited by the BIOS selectable vSPP. With a 2x2GB kit populating the DIMM slots now, I fully expect to see the same type of situation...but unfortunately, a little sooner in the clocks.
As suspected, memory clocks were held back by the SPP voltage maximum that can be set in the BIOS. This 790i SLI just isn't ready to play with the big boys right out of the box, it needs a little help. These modules have a lot more in them as proven by what they did on a modded and cooled 790i Ultra, but this board just can't get that out of them in stock form. On both the 2x1GB kit and more pronounced with this 2x2GB kit, CL7 clocks suffer the most. It appears that the CL7 clocking ability, or slight weakness in ability, of the 790i SLI chipset holds true from my 790i Ultra experience. The board should have no problem running any kit of memory available at specification...you just won't be breaking records without the appropriate renovations to the board.
Click link for full size screenshot...
775MHz :: 1.90v
815MHz :: 2.00v
850MHz :: 2.10v
895MHz :: 1.90v
915MHz :: 2.00v
950MHz :: 1.90v
978MHz :: 2.00v
My System Specs
Intel i5 660 - Clarkbar Power
4 x 4GB GSkill & OCZ mixing and matching
X800 GTO old school passive power
Who cares about anything else, I have a 10GB RAM drive.
Win 7 x64
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