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Comparison AMD R7 Performance DDR4 1x8Gb R748G2400U2S vs AMD R7 Performance DDR4 1x4Gb R744G2400U1S

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AMD R7 Performance DDR4 1x8Gb R748G2400U2S
AMD R7 Performance DDR4 1x4Gb R744G2400U1S
AMD R7 Performance DDR4 1x8Gb R748G2400U2SAMD R7 Performance DDR4 1x4Gb R744G2400U1S
from $62.84 up to $71.80
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from $32.11 up to $38.40
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TOP sellers
Memory capacity8 GB4 GB
Memory modules11
Form factorDIMMDIMM
TypeDDR4DDR4
Specs
Memory speed2400 MHz2400 MHz
Clock speed19200 MB/s19200 MB/s
CAS latencyCL16CL15
Memory timing16-16-16-3615-15-15-36
Voltage1.2 V1.2 V
Coolingradiatorradiator
Module profilestandardstandard
More features
overclocking series
XMP
AMP
overclocking series
XMP
AMP
Added to E-Catalogfebruary 2015february 2015

Memory capacity

The total volume of all modules of the RAM kit.

Knowing this parameter and the number of planks in the set, you can estimate the volume of one plank. This information can be useful for assessing compatibility with a specific PC: any motherboard has a limit on the maximum volume of each individual bar.

Now on the market there are kits with such a volume of memory: 4 GB, 8 GB, 16 GB, 32 GB, 64 GB and even 128 GB. The combination of several sticks allows you to sell sets of 8 GB (2 sticks of 4 GB), 16 GB (2 sticks of 8 GB), 16 GB (4 sticks of 4 GB), 32 GB (2 sticks of 16 GB), 32 GB (4 8 GB sticks), 48 GB (2 24 GB sticks). 64 GB kits are represented by the following sets: 64 GB (2 sticks of 32 GB), 64 GB (4 sticks of 16 GB) and 64 GB (8 sticks of 8 GB). 128 GB RAM mainly consists of 4 sticks of 32 GB or 8 sticks of 16 GB. And 256 GB and 96 GB (2 sticks of 48 GB each) are not so popular

CAS latency

This term refers to the time (more precisely, the number of memory cycles) that passes from the processor's request to read data to granting access to the first of the cells containing the selected data. CAS latency is one of the timings (for more details, see the "Memory Timings Scheme" section, where this parameter is designated as CL) — which means that it affects performance: the lower the CAS, the faster this memory module works. However this is true only for the same clock frequency (for more details, see ibid.).

Now there are memory modules on the market with the following CAS latency values: 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 30, 32, 36, 38, 40, 42, 46.

Memory timing

Timing is a term that refers to the time it takes to complete an operation. To understand the timing scheme, you need to know that structurally RAM consists of banks (from 2 to 8 per module), each of which, in turn, has rows and columns, like a table; when accessing memory, the bank is selected first, then the row, then the column. The timing scheme shows the time during which the four main operations are performed when working with RAM, and is usually written in four digits in the format CL-Trcd-Trp-Tras, where

CL is the minimum delay between receiving a command to read data and the start of their transfer;

Trcd — the minimum time between the selection of a row and the selection of a column in it;

Trp is the minimum time to close a row, that is, the delay between the signal and the actual closing. Only one bank line can be opened at a time; Before opening the next line, you must close the previous one.

Tras — the minimum time the row is active, in other words, the shortest time after which the row can be commanded to close after it has been opened.

Time in the timing scheme is measured in cycles, so the actual memory performance depends not only on the timing scheme, but also on the clock frequency. For example, 1600 MHz 8-8-8-24 memory will run at the same speed as 800 MHz 4-4-4-12 memory—in either case timings, if expressed in nanoseconds, will be 5-5-5-15.
AMD R7 Performance DDR4 1x8Gb often compared
AMD R7 Performance DDR4 1x4Gb often compared