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Help a Noob with Ram Speeds and Voltage

post #1 of 5
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Hey guys, this is my first post on here. I'm in the process of building my first desktop and I have a few questions regarding ram. I'm confused by the rated ram speed specifications on motherboards. Specifically, specifications like this "DDR3 2933+(OC)/2800(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066". Does this mean that you can overclock your 1600MHz ram to 1866, 2133, etc, or does it support 1866, 2133+ ram when overclocking something else? To add to this, Haswell supports 1333 and 1600MHz ram but I know that people are using faster ram. What is the reasoning for the 1333/1600MHz rating from Intel if faster ram works too? And lastly, ram voltages. I know the official specification is 1.5v, but why are there so many 1.65v kits? I'm probably going to pick up a processor and mobo this weekend at Microcenter while I'm home for the weekend so if I can get a ram order on newegg tomorrow, I won't have to do any waiting biggrin.gif Any help is appreciated! Thanks.
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post #2 of 5
Quote:
Originally Posted by CrusherW9 View Post

Hey guys, this is my first post on here. I'm in the process of building my first desktop and I have a few questions regarding ram. I'm confused by the rated ram speed specifications on motherboards. Specifically, specifications like this "DDR3 2933+(OC)/2800(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066". Does this mean that you can overclock your 1600MHz ram to 1866, 2133, etc, or does it support 1866, 2133+ ram when overclocking something else? To add to this, Haswell supports 1333 and 1600MHz ram but I know that people are using faster ram. What is the reasoning for the 1333/1600MHz rating from Intel if faster ram works too?

 

It's actually much more simple than that: the motherboard specifications that are shown here simply mean that the motherboard is extending the supported memory beyond what the CPU natively supports. That's why there's no "(OC)" next to "1600/1333/1066". As you noticed, the CPU natively supports DDR3-1333 and DDR3-1600, and so the motherboard is merely extending that support way beyond what the CPU natively supports. This means that in order to get your DDR3-1866 or higher memory at its stock speed, you have to set it manually because it will start at DDR3-1600 (or it probably will).

 

I don't know what "DDR3-2933+" means, but it sounds to me like it's saying that it supports the overclocking of DDR3-2933 in addition to simply supporting it.

 

 

Quote:
Originally Posted by CrusherW9 View Post

And lastly, ram voltages. I know the official specification is 1.5v, but why are there so many 1.65v kits? I'm probably going to pick up a processor and mobo this weekend at Microcenter while I'm home for the weekend so if I can get a ram order on newegg tomorrow, I won't have to do any waiting biggrin.gif Any help is appreciated! Thanks.

 

1.65V kits are still safe, but using a 1.65V kit would mean that you wouldn't really want to increase its voltage at all because it's already on the high side. So a 1.5V kit is at the recommended voltage, but you can still increase it for overclocking. 1.65V isn't the limit, but it's probably best to avoid going over 1.65V for 24/7 use because it might not be very good for the CPU's Integrated Memory Controller in the long run.

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post #3 of 5
Running 1.65v or more should not have any negative impact on the CPU IMC, as it's the voltage being sent to the DIMMs themselves. The VTT and VCCSA, however, if raised too high can cause CPU damage.
   
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

It's actually much more simple than that: the motherboard specifications that are shown here simply mean that the motherboard is extending the supported memory beyond what the CPU natively supports. That's why there's no "(OC)" next to "1600/1333/1066". As you noticed, the CPU natively supports DDR3-1333 and DDR3-1600, and so the motherboard is merely extending that support way beyond what the CPU natively supports. This means that in order to get your DDR3-1866 or higher memory at its stock speed, you have to set it manually because it will start at DDR3-1600 (or it probably will).
Thanks! that was a heck of a lot simpler than I thought it was. I'm going back home this weekend and there is a Microcenter close buy. I plan on buying a 4770k and a motherboard when I'm there. Now I just need to decide if I want to keep my Corsair XMS3 16gb 1600Mhz ram kit or sell it and get a 8gb set of Vengeance ram. I really don't need the 16gb so if I can sell the XMS ram, buy an 8gb kit, and save $40, I'm thinking that is the way to go. Plus, those Vengeance sticks just look so cool biggrin.gif
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post #5 of 5
Quote:
Originally Posted by CrusherW9 View Post


Thanks! that was a heck of a lot simpler than I thought it was. I'm going back home this weekend and there is a Microcenter close buy. I plan on buying a 4770k and a motherboard when I'm there. Now I just need to decide if I want to keep my Corsair XMS3 16gb 1600Mhz ram kit or sell it and get a 8gb set of Vengeance ram. I really don't need the 16gb so if I can sell the XMS ram, buy an 8gb kit, and save $40, I'm thinking that is the way to go. Plus, those Vengeance sticks just look so cool biggrin.gif

 

I admit that I almost bought the Vengeance simply because of the hexagonal artwork. At the time, I was obsessed with Crysis 2. lol I ended up with these G.SKILL Ripjaws X Series with beautiful red anodized heatspreaders that look awesome with the blue anodized heatsinks on my motherboard!

It's a computer!
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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