We have previously explored the importance of memory scaling within AMDs Ryzen CPUs: the question being answered today is how much of an effect on performance does the memory frequency have when Zen is paired with AMD’s own Vega graphics core. We run a complete suite of tests on AMD's Ryzen 3 2200G ($99) and Ryzen 5 2400G ($169) APUs with memory speeds from DDR4-2133 to DDR4-3466 using a kit of G.Skill Ripjaws V.

Recommended Reading on AMD Ryzen APUs

Memory Scaling on AMD Ryzen APUs

While adding Vega to Zen may be a new concept, the premise of the APU combing compute and graphics on the same chip remains the same. Graphics is often a memory bound operation - the speed at which the data can be accessed by the graphics is directly tied to the frame rate, and we have seen on chips in the past that the speed of the memory (or an interim cache) can vastly help accelerate the performance of the graphics. Graphics is usually the focus here, as faster memory only assists CPU workloads that are memory limited.

For example, see our articles on:

One of the main issues with memory right now is pricing. With the price of DDR4 having risen over the course of 2017 and with no signs of slowing in 2018, building a new desktop system has looked more expensive over the course of the last couple of years: the inflation of GPU pricing has also certainly contributed to those woes. While the general outlook on the current DDR4 DRAM market is that for a user wanting extra speed, more money must be spent is true, how that equates into actual performance becomes more relevant than ever before. On pricing, for example, here is a Corsair Vengeance LPX 2x8 DDR4-2666 memory kit over on Amazon:

The price of this memory when launched was $142, which decreased down to as low as $57 on sale but was an average of $75 during early 2016. Over the course of 2017 and 2018, this very popular memory kit is now trading at $179, having reached a high of $200. To put that in perspective, this kit launched at a cost of $8.88 per GB, went down as low as $3.56 per GB, and is now at $11.19 per GB. This is almost certainly a sellers market, not a buyers market. People are often spending money on capacity over speed. The goal of this article is to determine how much speed actually matters, especially when we look at lower-cost processors like the AMD Ryzen APUs.


Our APU with some other G.Skill TridentZ DRAM in an SFF test

For a user looking to build a budget system without focusing too much on high-end performance applications such as CAD or content creation, the Ryzen 3 2200 and Ryzen 5 2400 APUs has a lot to offer, especially when money is a highly limiting factor on purchasing decisions. As was within our Ryzen 5 2400G review, we concluded that AMD’s Ryzen 2000 series pairing offers the best value and performance compared against what’s currently on offer on both sides of the APU/CPU marketplace (Intel or AMD) when an iGPU is featured on chip.

Memory Scaling on APUs: More Infinity Fabric

Most of the following analysis in this section was taken from our previous Memory Scaling on Ryzen 7 article.

While we already know due to the previous testing we did with the Ryzen with what effect memory frequency has on the Zen cores, and AMD added a new element to this when it equipped the Ryzen 3 2200G and Ryzen 5 2400G with Vega. As per with the rest of the Ryzen processor range from AMD, each chip combines multiple technologies, but relatively speaking, the most relevant one which has the ability to affect memory performance on the Ryzen 2000 series is called Infinity Fabric.

The Infinity Fabric (hereafter shortened to IF) consists of two fabric planes: the Scalable Control Fabric (SCF) and the Scalable Data Fabric (SDF). The SCF is all about control: power management, remote management and security and IO. Essentially when data has to flow to different elements of the processor other than main memory, the SCF is in control. The SDF is where main memory access comes into play. There's still management here - being able to organize buffers and queues in order of priority assists with latency, and the organization also relies on a speedy implementation. The slide below is aimed more towards the IF implementation in AMD's server products, such as power control on individual memory channels, but still relevant to accelerating consumer workflow.

AMD's goal with IF was to develop an interconnect that could scale beyond CPUs, groups of CPUs, and GPUs. In the EPYC server product line, IF connects not only cores within the same piece of silicon, but silicon within the same processor and also processor to processor. Two important factors come into the design here: power (usually measured in energy per bit transferred) and bandwidth.

The bandwidth of the IF is designed to match the bandwidth of each channel of main memory, creating a solution that should potentially be unified without resorting to large buffers or delays. Discussing IF in the server context is a bit beyond the scope of what we are testing in this article, but the point we're trying to get across is that IF was built with a wide scope of products in mind. On the consumer platform, while IF isn't necessarily used to such a large degree as in server, the potential for the speed of IF to affect performance is just as high.

Test Bed and Hardware

As per our testing policy, we take a premium category motherboard suitable for the socket, and equip the system with a suitable amount of memory. With this test setup, we are using the BIOS to set the CPU core frequency using the provided straps on the MSI B350I Pro AC motherboard. The memory is set to the range of speeds as given for our testing.

Test Setup
Processors AMD Ryzen 3 2200G AMD Ryzen 5 2400G
Motherboard MSI B350I Pro AC
Cooling Thermaltake Floe Riing RGB 360
Power Supply Thermaltake Toughpower Grand 1200 W Gold PSU
Memory G.Skill Ripjaws V
DDR4-3600 17-18-18
2x8 GB
1.35 V
Integrated GPU Vega 8
1100 MHz
Vega 11
1250 MHz
Discrete GPU ASUS Strix GTX 1060 6 GB
1620 MHz Base, 1847 MHz Boost
Hard Drive Crucial MX300 1 TB
Case Open Test Bed
Operating System Windows 10 Pro

With the aim being to procure a set of consistent results, the G.Skill Ripjaws V DDR4-3600 kit was set to latencies of 17-18-18-38 throughout each of the different straps tested. Due to an inability to support 100 MHz straps on our motherboard, the XMP profile was enabled in the BIOS on the memory Ripjaws V kit and the latency timings adjusted to 17-18-18-38 manually on the MSI B350I Pro AC motherboard. Each of the straps set for the aim in continuity of testing for frequency scaling.

 

A side note on our previous experience with memory scaling. In the past we introduced a concept of a Performance Index (PI) for each memory kit, to give a rough performance comparison metric between memory brands. This PI was defined as the data rate (such as DDR4-2400) divided by the CAS Latency (such as the 17 in 17-18-18) rounded down to the nearest whole number. In previous articles like this, typically the memory with the highest PI scored the best overall, especially in gaming, although in combinations with similar PIs, the one with the highest frequency was often ahead. We will revisit this concept later in the review.

In this review, we will be testing the following combinations of data rate and latencies:

Data Rates
Tested
Sub-Timings Performance
Index
Voltage
DDR4-2133 17-18-18 2133 / 17 = 125 1.35 V
DDR4-2400 17-18-18 2400 / 17 = 141 1.35 V
DDR4-2667 17-18-18 2667 / 17 = 157 1.35 V
DDR4-2866 17-18-18 2866 / 17 = 169 1.35 V
DDR4-3333* 17-18-18 3333 / 17 = 196 1.35 V
DDR4-3466 17-18-18 3466 / 17 = 204 1.35 V

*Corresponds to XMP Profile 1 on this memory kit

AGESA and Memory Support

At the time of the launch of Ryzen, a number of industry sources privately disclosed to us that the platform side of the product line was rushed. There was little time to do full DRAM compatibility lists, even with standard memory kits in the marketplace, and this lead to a few issues for early adopters to try and get matching kits that worked well without some tweaking. Within a few weeks this was ironed out when the memory vendors and motherboard vendors had time to test and adjust their firmware.

Overriding this was a lower than expected level of DRAM frequency support. During the launch, AMD had promised that Ryzen would be compatible with high speed memory, however reviewers and customers were having issues with higher speed memory kits (DDR4-3200 and above). These issues have been addressed via a wave of motherboard BIOS updates built upon an updated version of the AGESA (AMD Generic Encapsulated Software Architecture), specifically up to version 1.0.0.6, but now preceded by 1.1.0.1 (thanks to AMD's unusual version numbering system).

Whilst the maturity of the Ryzen platform is no longer an issue generally faced, the AGESA 1.1.0.1 microcode specifically focused on supporting the new Raven Ridge Ryzen 3 2200G and Ryzen 5 2400G APUs was announced before launch; we covered these BIOS updates for AMD's Ryzen APUs back in February at launch.

The whole purpose of the today's testing is to evaluate the scalability on AMD's Zen architecture and to see if the performance can be influenced by increasing the DRAM frequency. It would be foolish to not establish the effect on gaming performance and to see if memory frequency has a direct impact on frame rates given that previous generations of AMD APU have been reported to do so. 

This Review

In this article we cover:

  1. Overview and Test Bed (this page)
  2. CPU Performance
  3. Integrated Graphics Performance
  4. Discrete Graphics Performance with a GTX 1060
  5. Conclusions
CPU Performance
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  • Meat Hex - Thursday, June 28, 2018 - link

    I would not read into these graphs and tests too much as they are only showing you the % gained from higher speed memory and not the actual FPS. You're still going to have a higher FPS on the 2400G vs the 2200G. Reply
  • PeachNCream - Thursday, June 28, 2018 - link

    The 2200G is a reasonable CPU and the price is good for the performance you get back. If you do upgrade to a dedicated graphics card later (unlikely given the HTPC role you're aiming for due to heat, power, noise, and space concerns) the dGPU benchmarks show most of the games measured demonstrate the 2200G is relatively close in performance to the 2400G so there's that as well. Reply
  • sing_electric - Thursday, June 28, 2018 - link

    Especially for an HTPC, "good enough" performance is often EXACTLY what you want, especially when you're considering chips on the same architecture/process, since the 2200G will make less heat, making the entire system run cooler, which, in turn, can mean a quieter system. Reply
  • Lolimaster - Friday, June 29, 2018 - link

    It's all about the extra thread that will minimize stuttering from 4c/4t cpu, and will handle better a dgpu higher than a 1060. Reply
  • GreenReaper - Friday, June 29, 2018 - link

    To be honest it might make the most sense to buy the APU, then the dGPU later, then a later-model CPU using 7nm architecture to replace the APU. Reply
  • drzzz - Thursday, June 28, 2018 - link

    After reading the article I was expecting a conclusion to talk heavily about DDR-3333 memory and how it performed the best overall and clearly point out that speeds over that seemed to fall off and maybe some insightful thoughts on why that was seen. Given the spikes at 2933 and 3333 compared to 2400 it would seem to indicate there is some steady state synergy with the IF, memory and the caching mechanics that only manifest at specific bounds in the frequency increase. Again expected more about these two points in a conclusion vice the 2133 to 3466 differences that were talked about. The performance at 2933 and 3333 makes me curious if there is some logical hard design choice AMD made that would make memory selection easier for us once we identify it and if the same factors play into all the Zen based CPU's. I find it interesting that the xx33 speeds seem to be the strong points. So I am curious what would 2533 and 3733 look like. I know 3733 is not a realistic option. If the xx33 speeds are the best performing across the spectrum I would seriously love to know why and if same is true for Zen base CPU's. Reply
  • peevee - Tuesday, July 03, 2018 - link

    "Given the spikes at 2933 and 3333"

    No spikes, the steps are different in size.
    And of course the simply misleading slowing of latencies on slower frequencies by setting CL etc to the same value.
    Reply
  • zodiacfml - Thursday, June 28, 2018 - link

    Do a review of the GT 1030 with DDR4. Reply
  • PeachNCream - Thursday, June 28, 2018 - link

    Do you mean the GT 1030 that uses DDR4 on the card as opposed to the GDDR5 model? If that's the case, I'd like to second that. The performance difference between the two memory types would be worth analyzing. As the GDDR5 model is a bit ahead of AMD's APUs, I'd imagine the DDR4 model would cost enough performance to hand the performance advantage back to a 2400g, but it'd be useful to see that play out in Anandtech's benchmarks. Reply
  • TheWereCat - Thursday, June 28, 2018 - link

    Gamers Nexus released their review yesterday.
    Apparently the GT1030 DDR4 is so starved for memory bandwidth that at best it performs "only" 50% worse than the GDDR5 version and at worst it falls 2x short.
    That makes it worse than a 2200G paired with a single channel 2400MHz DDR4.
    Reply

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