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Need help what does PC4 mean

post #1 of 7
Thread Starter 
what does PC4 mean on ram and doesn't matter that it's different between types of ram
post #2 of 7

All I think you need to worry about is finding memory that you know is compatible with your motherboard, and we generally look at whether it's DDR, DDR2, DDR3 or DDR4 (I've never seen the "PC" thing matter at all). So, what do you have for a motherboard?


Edited by TwoCables - 7/28/16 at 8:44pm
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post #3 of 7
Thread Starter 
already have the computer built i just wanted to add more ram but newegg sold out of the type of ram i got



motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813132260


ram i have http://www.newegg.com/Product/Product.aspx?Item=N82E16820211914
post #4 of 7
Naming scheme for the DIMM. I believe "DDR4" refers to the memory chips themselves while "PC4" refers to the DIMM, the memory stick you plug into the slot. For example, DDR4-3200 refers to a memory chip that runs at 3200MT/s (megatransfers per second) while PC4-25600 refers to a DIMM that transfers 25.6GB/s. The PC4-25600 DIMM uses a bunch of DDR4-3200 chips, however.

Realistically it's nothing to focus on. The vast majority of people use the DDR#-WXYZ format, even though it's technically incorrect, rather than the PC#-VWXYZ format. DDR4-2800 and PC4-22400 are more or less the same thing on a shopping site, and they only really differ in the engineering white papers. thumb.gif
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post #5 of 7
Thread Starter 
so if i understand you the pc4 it's basically the same thing as the speed of the memory
post #6 of 7
Quote:
Originally Posted by jaront2008 View Post

so if i understand you the pc4 it's basically the same thing as the speed of the memory

It's the memory bandwidth, yeah, rather than the transfer rate. But you can get from point A to point B pretty easily:

(64-bit bus) * (1 byte / 8 bits) * (megatransfers / second) = (megabytes / second)

Which reduces to a 1:8 ratio of transfer rate to bytes per second. Unit cancellation. Use it. Love it. biggrin.gif
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For Sale: [FS] Z97 system: Xeon and RAM
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post #7 of 7
Quote:
Originally Posted by jaront2008 View Post

so if i understand you the pc4 it's basically the same thing as the speed of the memory

 

All you need to do is find DDR4 memory that's as similar as possible to the memory you have now. Make sure all of the specs are the same and you should be good to go. Make sure the rated voltages are the same, and make sure the "timings" are the same too.

 

You don't have to worry about anything else. So, let's stop looking at this "PC4" thing and focus on what really matters.  DDR4, the clock speed, the rated voltage, and the timings. Get the best memory you can and you should be all set.

It's a computer!
(18 items)
 
  
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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(18 items)
 
  
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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
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