This is the delay, in cycles, between the pins of the memory module electronically receiving a signal and the module starting the Row Access Strobe to locate and retrieve (or write) it. It can have an impact on performance when programs use large blocks of memory that span several rows.Īctive to Precharge Delay. Like tRCD, this value is typically between 3 and 5 cycles for modern memory systems. This is how much time it takes for the memory to stop accessing one row and start accessing another. Sequential bits of data are usually stored along the same row in memory, so rows are not re-selected nearly as often as columns. This value is usually between 3 and 5 cycles, but it doesn't tend to have a huge impact on performance. This is the delay, in number of cycles, between finding the row of a location in memory, and finding the column.
CAS is the amount of time, in cycles, between receiving the column access command and acting upon it. Data is stored in an array of columns and rows–the row is selected first, then the column is selected and the data in memory is either read from or written to. This is actually the last stage in finding where data is physically located in RAM. That's a lot of weird abbreviations, so here's the basics of what they mean:Ĭolumn Access Strobe (sometimes Column Access Select). A four-number designation would be something like 3-4-4-8, in which the four numbers relate to CAS – tRCD – tRP – tRAS. CL=2.5, CAS=2.5, or C=2.5 would be common "single number" listings for RAM with a CAS latency of 2.5 cycles, for instance. It's either a single number denoting the CAS latency, or a string of four numbers denoting several latencies. Memory latency is almost always designated in one of two ways. Low latency memory, running at low latency settings, supposedly speeds up your system without requiring you to overclock it. Memory speed is certainly important if you're considering overclocking, but for now we're concerned only with latency.
When you buy RAM, you'll see two main speed ratings listed: frequency (the maximum rated clock rate), and latency. Most I found are around 700-800.00 US for 8gb (2x 4gb sticks), while the 4gb (2x2gb sticks) are around 50-60.00 US. Can't afford to go to 8gb, that is still too expensive for me. All the 2gig sticks seem close in values, which is what I'm looking at. Seems like they are all pretty close depending on what size you go with. What about all the latency values CAS, tRCD, tRP, tRAS? I'm thinking of going with crucial right now cause of the recommendations on .īut then I read about one guy on gearslutz getting clicks and pops.Īnyone have any problems with crucial RAM? In your guys opinion is there a better manufacturer?
#Who makes owc memory upgrade#
Which brand is best Crucial, OWC, Micron, Samsung, or Techworks?Ĥ.0GB Upgrade Kit (2.0GB Modules x 2 Matched)Ĥ.0GB Upgrade Kit (2.0GB Modules x 2 Matched) CAS 4 High-Performance tuned low-latencyįor $3 more should I go with the CAS 4 High-performance tuned low-latency? I was originally thinking of going with something from Two individuals recommend crucial RAM for my MBP.Ĭ even has a nice little app which determines that RAM upgrade you need for you, and then directs you to their webpage.
#Who makes owc memory mac#
Help me upgrade my MBP Ram, best kinda ram? - Mac Forumsīasically asking for confirmation that I had chosen the right RAM, and asking for brand recommendations.
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