Does RAM Speed Matter for Mini PC Gaming?

When comparing gaming PCs, there’s a number of specs you might look at. Things like GPU benchmarks, the CPU, and how much RAM it has. But when it comes to Mini PCs for gaming, there’s one underrated spec that turns out to matter quite a lot: RAM bandwidth.

Here’s a data-driven chart that shows how RAM bandwidth can impact gaming performance for several popular iGPUs.

A 660M is perfectly content with dual channel DDR5-4800 - but the same RAM config is a little tight on a 780M. With an 890M - shoot for the best RAM you can get, to maximize performance.

Why make this chart?

Unlike a larger gaming desktop, Mini PCs have their CPU and GPU all on one chip, which shares the same RAM. That means the speed and configuration of a Mini PC’s memory can have an enormous impact on gaming performance. I was aware of this impact when making MiniPCs.zip - but I had significantly underestimated it! When it comes to gaming Mini PCs, getting the right RAM is crucial (no pun intended).

However, while this has been known by enthusiasts for quite some time - it’s hard to quantify the exact improvement that comes from bumping up a ‘tier’ on the RAM ladder. For instance:

• Does it make sense to get expensive RAM on an inexpensive iGPU?
• Is the performance bumping from DDR5-4800 to 5600 equal to the bump from 5600 to 6400?
• Which PC optimizes my budget perfectly between iGPU and RAM?

Methodology

To answer these questions, we will create a basic two parameter (not-AI) model, feed it a GPU and a RAM configuration, and get some relative performance measure out. In order to do this, we have to:

Step 1: Reduce “RAM configuration” to a single variable.
Step 2: Gather as much data as possible on different GPUs and different RAM bandwidths
Step 3: Fit a simple model to this data

Step 1: Transform RAM config to RAM bandwidth

To help simplify the problem, let’s move away from labels like DDR4, DDR5, or LPDDR5X, and normalize memory configurations into one useful measurement: theoretical memory bandwidth, in GB/s. There are other concerns with RAM performance, such as latency and controller behavior - but bandwidth really is the name of the game here.

Fortunately this calculation is very straightforward:

Single channel DDR4 or DDR5 has a 64 bit bus width, dual channel has 128 - LPDDR5 generally has 128 bit bus width - very high-end machines (IE with Ryzen AI Max+) may even have 256 bit bus width with LPDDR5X.

With this in mind - we can turn any RAM configuration into a single speed value.

Step 2: Gather lots of data

Many reviewers, PC enthusiasts, and run-of-the-mill nerds have done testing on their own devices to see the improvements to game FPS or benchmarks that improving RAM has made. While useful anecdotes, many of these tests only give us a tiny slice of data - the same machine tested in two configurations. But by collecting enough of these data slices, we can combine them into a full data pizza. Here are our sources - huge thanks to all who have done this work so we can have data to work with.

Feel free to scroll past this or investigate each source to your heart’s content.

Step 3: Combining the data

Looking across these experiments, a number of things become obvious.

1. At low bandwidth, additional memory bandwidth can produce enormous improvements.
2. As bandwidth increases, the performance gains become progressively smaller.
3. More powerful iGPUs can benefit from higher bandwidth before reaching diminishing returns.

But how can we turn this all into something useful and actionable? By fitting a logistic response curve, which naturally models diminishing returns!

The above regression is just using data for the 780M - since we have several iGPUs in this dataset, we can use all of that data to create a more adapatable regression, where an iGPUs ‘RAM-hungriness’ factor is estimated from its synthetic benchmarks.

How MiniPCs.zip uses this model

The numbers that come out of this model are all relative - and very rough approximations. I totally understand this. Actual impact on performance depends on a dozen other factors, including hardware, software, and perhaps most importantly - the game you’re playing. However, the goal of this simple model isn’t to give a 100% perfect performance estimate for any machine, any game - (though it certainly helps move in that direction) - it’s to determine if a given iGPU has performance headroom that can be unlocked with a different RAM setup.

When browsing MiniPCs.zip Before, if a Mini PC had a great iGPU on paper, and 24GB of RAM at a low price, it would shoot straight to the top of the list - even if it was single-channel DDR4. I originally published a small fix for this which just linearly interpolated RAM speed - but this doesn’t account for diminishing returns, or how a weak iGPU doesn’t suddenly become stronger with super-charged RAM.

I’m much happier with the results on the site now - feel free to check them out if you have time. For a broader look at how deal scores work, see our methodology guide.

Background and Jargon

Single vs. Dual Channel

Many Mini PCs have two RAM slots. Installing a RAM stick in each allows the CPU to access both memory channels simultaneously, essentially doubling memory bandwidth without changing the RAM’s actual speed. Two 8GB sticks will perform much better than one 16GB stick.

The true technical definition of channel is more complex (one stick of DDR5 has two 32-bit sub-channels) but in conversation, this mostly refers to using one vs both slots.

DDR4 & DDR5

Two generations of RAM. DDR5 offers substantially faster data transfer rates, sometimes more than twice those of DDR4. You’ll often (ideally, in fact) see the speed listed after the generation e.g., DDR5-5600, meaning 5,600 million transfers per second (MT/s).

SO-DIMM vs. DIMM

SO-DIMMs are smaller versions of the RAM sticks (DIMMs) found in full-sized desktop PCs. They use the same memory technologies, such as DDR4 and DDR5, but their compact size makes them ideal for laptops and Mini PCs.

LPDDR5 & LPDDR5X

LP stands for “Low Power.” This RAM is designed for devices like laptops and Mini PCs. Unlike SO-DIMM - it’s soldered directly to the motherboard, meaning it can’t be upgraded.

The term ‘dual channel’ is less useful here, since these components have a different architecture, but most modern Mini PCs with LPDDR5 provide bandwidth comparable to or greater than dual-channel DDR5.

LPDDR5X is an improved version that supports even higher speeds.

LPCAMM2

A newer, removable memory format for LPDDR5 and LPDDR5X, combining the speed and efficiency benefits of low-power memory with the ability to upgrade it later. One LPCAMM2 module can provide a full 128-bit, dual-channel interface.

It’s beginning to appear in higher-end laptops but remains uncommon in Mini PCs.