- Key Takeaway: The Coalition developed a custom SSD memory-paging system for Gears of War: E-Day on Xbox Series S, using the NVMe drive as an additional memory tier to supplement the console’s 10GB of GDDR6 RAM.
- Studio technical director Kate Raynor revealed the technique to Digital Foundry — the system uses advanced heuristics to decide which data to offload to the SSD versus what stays in fast system RAM.
- The approach yielded approximately 1GB of additional usable system memory, drawn from several gigabytes of SSD space, avoiding significant visual downgrades on Series S.
- The game’s world contains 1.6 million individual elements, making memory capacity one of the biggest development challenges for the weaker hardware.
- Gears of War: E-Day launched October 6 for Xbox Series X|S and PC, with early access from October 1 for Premium Edition buyers — it’s also day-one on Xbox Game Pass.
- The Steam early access peak hit 20,374 concurrent players, nearly doubling the Gears franchise’s previous Steam record set by Gears 5.
The ongoing discussion about whether the Xbox Series S is holding back this generation just got a compelling counter-argument. Gears of War: E-Day is one of the most demanding games on Xbox right now — a visually stunning Unreal Engine 5 title co-developed by The Coalition and People Can Fly — and it’s running on Series S thanks to some genuinely clever engineering under the hood. The studio tapped into the console’s SSD to solve a memory problem that could have resulted in a significantly stripped-down version of the game.
The technique was detailed in a new feature by Digital Foundry, with The Coalition’s studio technical director Kate Raynor explaining how the team approached the hardware gap between the Series X and Series S.
The Series S Memory Problem
The Xbox Series S ships with 10GB of GDDR6 RAM, compared to the 16GB on the Series X. That 6GB gap might sound manageable, but for a game like Gears of War: E-Day — which packs 1.6 million individual world elements into its dense environments — it’s a significant constraint. The game is visually complex by design, and trying to shove all of that data into 10GB simply doesn’t work without serious compromises.
Microsoft requires that games releasing on Xbox Series X also run on Series S, which means developers can’t just ignore the cheaper hardware. The Coalition needed a way to make E-Day’s level of visual fidelity work on a machine that wasn’t built to hold all of it in memory at once.
How the SSD Memory Trick Works
The concept behind the solution is similar to how your PC handles running out of RAM — using a portion of storage as overflow memory through a system called a Page File. The problem with standard Page File behavior is that SSDs, fast as they are, are nowhere near as quick as RAM. Every time the system has to pull data back from the drive into memory, there’s a performance penalty. Lean on it too heavily or too frequently, and the result is stuttering and slowdown.
The Coalition’s approach is fundamentally smarter than a standard Page File. Rather than using the SSD as a general overflow bucket, the system uses advanced heuristics to selectively decide what gets moved where. It constantly tracks access patterns — monitoring which data was used in recent frames and which hasn’t been touched. Data that isn’t actively being used within a frame, or hasn’t been needed over a run of frames, becomes a candidate for offloading to the SSD. Data that’s being referenced every frame or frequently stays in the fast GDDR6 RAM where it needs to be.
As Raynor explained, the system “lets the game use the NVMe drive as random access memory, giving the streaming system enough room to load and hold the complex city data. Memory that isn’t being actively accessed is stored on disk, and what’s needed at that moment is moved into system RAM.”
The critical distinction from a standard Page File is that The Coalition explicitly identified which subsets of memory were safe to page out without impacting performance. It’s not a blanket policy — it’s a curated list of memory categories that the team determined can tolerate occasional latency from coming back off the drive. The rest stays in RAM, untouched by the paging system entirely.
The Result: About 1GB of Extra Memory
In practice, using several gigabytes of SSD space through this approach yielded approximately 1GB of additional usable system memory for E-Day on Series S. That might not sound dramatic, but for a game at the edge of what the hardware can hold, 1GB is the difference between a city environment that loads at full fidelity and one that requires significant visual compromises. The Coalition used this headroom alongside dropping Lumen reflections on Series S to hit a performance target that would have otherwise been out of reach.
The technique does have limits. Raynor acknowledged that performance can degrade over time if the page file data gets refreshed into memory too frequently — because even selective paging carries a cost. The heuristics are designed specifically to prevent that from happening at a rate that noticeably affects the experience, but it’s not an infinitely scalable solution. It’s a precision tool used carefully, not a blanket fix for the memory gap.
Why This Matters Beyond E-Day
The conversation around whether the Series S is constraining current-gen development has been running since the console launched. Several developers have pushed back against the hardware’s limits, and the argument that it forces compromises across the entire Xbox ecosystem has been persistent. The Coalition’s technique is notable because it demonstrates a concrete engineering path for working around the RAM ceiling without simply delivering a gutted version of the game.
Whether other studios adopt a similar approach depends on whether they have the technical depth and time to implement heuristic-driven paging systems specifically for Series S. It’s not a trivial engineering task, and not every team will have the bandwidth or expertise to build something comparable. But the fact that it works, and works well enough that E-Day’s Series S version has been praised rather than criticized at launch, establishes that the limitation is at least solvable.
Gears of War: E-Day at Launch
The game officially launched on October 6, 2026 for Xbox Series X|S and PC via Steam and the Microsoft Store. Premium and Collector’s Edition buyers got five-day early access from October 1. It’s available day-one on Xbox Game Pass Ultimate and PC Game Pass, and supports Xbox Play Anywhere for shared progression across console and PC.
The early access window already set a franchise record on Steam — 20,374 concurrent players at peak, nearly double the Gears franchise’s previous Steam high of around 10,000 set by Gears 5. The game currently holds an 81% positive rating on Steam, making it The Coalition’s highest-rated entry on the platform. Reviews have described it as one of Xbox’s strongest first-party releases in years, with The Coalition itself proud to have positioned E-Day as one of the platform’s flagship exclusives.
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