AMD recently released a new generation of desktop Ryzen APU, combined with Zen CPU, Vega GPU architecture, but also the new 14nm process, regardless of design, specifications or performance, the price is perfect.
As we all know, APU due to high integration, the memory channel, the frequency is very sensitive, so single channel, dual channel memory, Ryzen APU performance will be different? 2400MHz, 2933MHz, 3200MHz and other different frequencies will have much difference?
GamersNexus did a special test on this, using a Ryzen 5 2400G APU, with four different sets of memory: Chihkan Trident Z 3200MHz CL14, Chiqi Ripjaws V 2400mh CL15, Geely EVO X 3200MHz CL16, Viking Ship Vengeance LPX 2933MHz CL16, all with 8GB x 2 capacity, and a Chi-Chi Trident Z 3200MHz 8GB for single-channel testing.
The test does not overclock, after opening XMP other keep the default.
"Rocket Alliance": Dual-channel performance is 80% higher than single-channel performance, especially since the latter is sluggish 3200MHz can be as much as 20% higher than 2400MHz but only 6% less than 2933MHz.
"DOTA2": Almost, dual-channel instant speed up 79%, but the frequency is not large, 3200MHz only 13% higher than the 2400MHz, and 2933MHz few and no difference.
"CSGO": Dual-channel leading 83%, 3200MHz frequency is still not a lot of lead, up to 12%.
"Watch the Pioneer": 71% advantage from dual channel, but the frequency of impact is relatively small.
"Sniper Elite 4": Dual channel is still able to lead almost 60% single channel, but do not be too concerned about the frequency, 3200MHz is only 14% higher than the 2400MHz.
3DMark Fire Strike Memory Tests: In theoretical tests, dual channels still outperformed single channels by 60%, but the high-frequency advantage was at most 11%.
3DMark Time Spy Memory Test: Dual Channel continues to lead 52%.
In addition, this test uses three motherboards, namely Gigabyte Gaming K5 X370, ASRock Pro4 B350, MSI Tomahawk B350, then the big difference?
The same is 3200MHz, CL14 timing when the performance difference between the three motherboard does not exceed 2%, but CL16 can reach about 8%.
summary:
First of all, For the APU, dual channels are absolutely required, up to 50-80% more than single channel performance, so they prefer two 4GB and one 8GB.
It is worth mentioning that, because of some notebook design restrictions, may only be allocated to the APU with a memory, this time to pay attention to whether it can expand on its own, if not, then firmly do not touch.
Second, Memory frequency APU performance also has an impact, 2400MHz is certainly not enough, but it is not necessary to have 3200MHz, most of the time 2933MHz has been basically put in place.
Of course, if the budget is limited, can not buy high-frequency memory or can not be overclocked, 2400MHz is not unacceptable, do more will lose 10-15% of the way, far less single-channel gap so big.
third, Timing is also affected, CL14 is significantly better than the CL16, So buy memory can not only look at capacity and frequency.
At last, The motherboard also has an impact, but generally negligible, the X370 can bring some boosts but the price is much higher, or the B350 is the best.
PS: This test project is a game, the impact of single-and double-channel in other applications must be different, but in any case, a single channel is not desirable.
