Due to the bulk of the Ryzen 4000 Mobile series of notebooks, AMD focused its memory management on two separate parts, giving the manufacturers of these capable books the ability to choose, not only the speed of modules, but the type of memory to use.
So, the highest options recommended by AMD for these APUs were DDR4-3200 MHz or LPDDR4-4266 MHz, where as we can see, the speed difference is much appreciated, but, why drop LPDDR5 when you bring so much improvement?
LPDDR5 vs LPDDR4X vs LPDDR4: where the concept is more important than improvement
AMD, unfortunately, has little to say in the field of memory either by implementation or by standards. What the Ryzen 4000 does is the company's best move in mid-2020, because as we'll see below, it still had no real options.
To understand why, we will continue to compare the three most commonly used memory types in the most commonly used industry, that is, we will deal with LPDDR5 vs LPDDR4X vs LPDDR4 and with this we will resolve all doubts.
| LPDDR4 | LPDDR4X | LPDDR5 | |
|---|---|---|---|
| High speed | 4266 Mbps | 4266 Mbps | 6400 Mbps |
| Power allowed | From 4 GB to 32 GB | From 8 GB to 96 GB | Only 12GB and 48GB |
| Channels | 2 x 16 bit | 2 x 16 bit | 1 x 16 bit |
| Properties | x64 | x86 and x64 | x86 |
| Maximum, low and minimum voltage rating | 1.8V – 1.1V – 1.1V | 1.8V – 1.1V – 0.6V | 1.8V – 1.05V – 0.9V – 0.5V |
| Sector | Mobile and PC | Mobile and cars | Mobile and cars |
As we can see, the LPDDR4, though much smaller than its new invoice competitors, is the only memory type that can be used on the Ryzen 4000.
In addition, despite its low MT / s, it has the property that in one APU it determines: Free channel.
This is something that is shared with LPDDR4X, but that does not include LPDDR5, which even though it may have a desktop version can be postponed due to its unique 16 channel, although the number of banks has doubled.
LPDDR4X is limited to certain categories
The best choice for AMD from a point of view of use, temperature and efficiency would have been LPDDR4X, but both Samsung and other manufacturers decided to boost the global DRAM market due to manufacturers' problems with batteries and their independence, therefore, needed a low power memory type, because LPDDR4 on smartphones was, by quotes, a failure due to different uses.
So, AMD chose the best it had on the table, especially while waiting for the DRAM class to run low bandwidth, low bandwidth, low power, low power memory. .
However, the adoption of the LPDDR4 when taken over at 4,266 MHz speeds is an option for Ultra laptops that offers a surprising performance thanks to the Zen 2 build on the Ryzen 4000 series, which we have already seen in the related article on AMD architecture. IF buses from DRAM, received better power consumption and enhanced the performance of its IGPU.
