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G.SKILL Ripjaws or Patriot Viper for DDR3??

Memory speed isn't a limiting factor in an overclock of an i5 chip. Basically, pick the speed you want to run (1333, 1600, 1866, 2000, etc.) and buy the corresponding sticks. However, you most definitely want the G.Skill sticks, and the fact that they're recommended for P55 series chipsets means something. You'll notice that they'll run their rated speed and timings with only 1.5V, the Patriot sticks require 1.8V to run similar settings. The maximum recommended Vdimm for P55 series CPUs is 1.65V; 1.8V will permanently damage your CPU in a short while.
 
MrK6 said:
The maximum recommended Vdimm for P55 series CPUs is 1.65V; 1.8V will permanently damage your CPU in a short while.
Click to expand...


I don't know anything about P55 based overclocking but are cpu and ram voltage tied together?
 
edplayer said:
I don't know anything about P55 based overclocking but are cpu and ram voltage tied together?
Click to expand...
With any i5 or i7 series CPU, the memory controller is now located on the actual CPU itself, and evidently is more sensitive to overvolting. I believe there's also a parameter that VTT and Vdimm can't be more than .5V different (i.e., 1.1V VTT, don't exceed 1.6V Vdimm), but don't quote me on that. I think it all stems from so many different controllers now being located on the CPU itself, everything is that much more sensitive.
 
I'll admit, I'm pretty biased here... but my advise is to stay the hell away from any of Patriot's "high end" memories. I've attempted to use their stuff 3 times now and each time resulted in an RMA.... practically right out of the box
 
I bought those very same G Skills 2 weeks ago to pair up with my EVGA P55 mATX and I7 860. I picked them mainly because the voltage required is 1.5v. Everything else is using 1.65v. Also the color on the heatspread goes well with my color scheme. I am able to run mine on stock voltage.
 
I have the same G.Skill RAM and have no complaints. I've been toying with the settings, the XMP profile is read fine by my motherboard and I've tweaked manually too, though with the latest BIOS updates I'm back on 'standard' until I have time to tweak again. I have an i7 860 running in a Gigabyte board (GA-P55M-UD2) which gives me the option to run a 12x multiplier without changing bclk, easiest thing to do.

spacegoat - when you say you're running at 'stock' voltages, do you mean you left them on 'auto', or that you manually set them to the rated voltage? If you set the V manually, what did you set it to? That's one setting I've been hesitant to play with until I have more time. They're rated at 1.5V, but it seems to me when I look (e.g. HWMonitor) they're running somewhere around ~1.56-1.58.
 
I've got a pair of G-Skill PC3-12800 Ripjaws and as others said, they're great because they run most of their speeds (1066 MHz, 1333 MHz) at only 1.5; the top speed (1600) is at 1.65V (or 1.6V; I forget).

Stay away from any DDR3 sticks that require above 1.65V if you're running them with any Core i5/i7 CPU; anything above 1.65V can and will permanently damage the CPU over time (according to Intel).
 
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jiffylube1024 said:
I've got a pair of G-Skill PC3-12800 Ripjaws and as others said, they're great because they run most of their speeds (1066 MHz, 1333 MHz) at only 1.5; the top speed (1600) is at 1.65V (or 1.6V; I forget).
Click to expand...

Which G.Skill 12800's do you have? How do you know they're top speed is at 1.65V (or 1.6V)? I'm using the same kind as noted by the OP (G.SKILL Ripjaws Series 4GB (2 x 2GB) DDR3 1600 (PC3 12800) F3-12800CL9D-4GBRL ). Based on their specs the top speed still takes 1.5V. So I'm wondering if you have a different type/model, or if I'm reading something wrong?

Last week I manually set the RAM to 12x (i.e. 1600) with 9-9-9-24 2T timings and DRAM Voltage to 1.5V. I haven't stressed it but I ran it through a few hours of memtest86+ and in general everythings been running fine. Although when I check the RAM is usually showing up as ~1.54V.
 
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