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Cooler Master RS700-ASABL3-UK GX-Lite 700W Power Supply — main product image
Cooler Master

Cooler Master RS700-ASABL3-UK GX-Lite 700W Power Supply

★★★★★4.7 (5 reviews)
700W

An 86–88% efficient single-rail 700W supply that keeps mid-to-high-range builds powered cleanly without overcomplicating the wiring harness.

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Overview

The Cooler Master GX-Lite RS700-ASABL3-UK is a 700W ATX power supply built around a single 12V rail architecture with a rated efficiency of 86–88% under typical load. In practical terms, that efficiency figure means less than 100W is converted to waste heat at full draw — a meaningful reduction in chassis thermal load compared to older sub-80% efficient units. The single-rail topology consolidates the full 12V current budget into one pool, eliminating the artificial per-rail limits that can cause nuisance shutdowns when a high-TDP GPU pulls aggressively. Protection circuits cover OVP, SCP, and OPP — the core fault scenarios — and the >17ms hold-up time meets ATX specification for riding through brief AC interruptions cleanly.

This PSU targets mid-to-high-range desktop builds where budget discipline is a factor and modular cabling is not a strict requirement. It's a practical fit for systems running a discrete GPU in the 150–200W TDP range alongside a modern multi-core CPU, without the overhead cost of a Gold or Platinum certified unit. Power users running dual-GPU setups or next-generation GPUs with TDPs above 250W should evaluate whether 700W provides sufficient headroom under combined CPU and GPU load. The fixed cable harness requires more cable management effort than modular designs, making it better suited to mid-tower and full-tower cases where excess cable can be routed behind the motherboard tray rather than left loose in the airflow path.

Key Features

Efficiency: 86% Typically

OVP/SCP/OPP Protection

Hold Up Time: >17ms

Specifications

Brand
Cooler Master
Model
RS700-ASABL3-UK
Wattage
700W
Efficiency
86% typical, up to 88%
12V Rail Configuration
Single rail
Hold-Up Time
>17ms
Protections
OVP, SCP, OPP
Form Factor
ATX
Cable Management
Fixed (non-modular)

Pros & Cons

👍 Pros

  • 86–88% efficiency rating reduces wasted heat output compared to sub-80% PSUs, keeping the chassis cooler under sustained load.
  • Single 12V rail architecture allows the full current budget to be drawn by any connected component without per-rail caps interrupting high-demand GPUs or storage arrays.
  • OVP, SCP, and OPP protection circuits guard against the three most common electrical fault conditions, providing a hardware safety net for downstream components.
  • >17ms hold-up time meets ATX specification, ensuring clean power delivery through momentary AC interruptions such as UPS transfer transitions.
  • 700W output gives adequate headroom for mid-range GPU plus multi-core CPU configurations without requiring a higher-tier unit.

👎 Cons

  • The RS700-ASABL3-UK does not carry a clearly documented 80 PLUS tier badge (Bronze, Gold, etc.), making efficiency comparisons against newer certified units less straightforward.
  • No modular or semi-modular cable design — all cables are hardwired, which increases cable clutter inside the chassis compared to modular alternatives at this wattage class.
  • 700W is a constrained budget for pairing a modern high-TDP discrete GPU (250W+) with a 12+ core CPU under full synthetic load; sustained workloads may push utilization close to the rated ceiling.
  • The UK model designation (RS700-ASABL3-UK) indicates it was designed for the UK/EU market; buyers outside that region should verify input voltage range and plug compatibility.
  • Hold-up time is rated at the minimum ATX threshold (>17ms), not the extended hold-up found on higher-end or server-grade supplies.

Frequently Asked Questions

It uses a single 12V rail. A single-rail design delivers all available 12V amperage as one pool, meaning a high-draw component like a GPU can pull what it needs without hitting per-rail current limits. This simplifies load balancing and avoids the nuisance tripping that multi-rail designs can exhibit under uneven loads.
The unit includes OVP (Over Voltage Protection), SCP (Short Circuit Protection), and OPP (Over Power Protection). These three cover the most common failure modes: voltage spikes that could damage components, dead shorts on a rail, and sustained overload beyond the PSU's rated output.
Hold-up time is how long the PSU continues delivering regulated power after input AC drops out. The >17ms spec meets the ATX standard minimum, meaning the system remains stable through brief AC line interruptions — such as the momentary drop during a UPS switchover — rather than crashing and corrupting data.
The RS700-ASABL3-UK uses a standard ATX form factor and should be physically compatible with current motherboards. However, it predates the PCIe 5.0 connector specification — GPUs requiring a 16-pin 12VHPWR connector will need an adapter, and 700W may be a tight budget for high-TDP cards like an RTX 4080 paired with a power-hungry CPU.
Cooler Master lists typical efficiency at 86%, with up to 88% under optimal load. The product predates widespread 80 PLUS tiered certification labeling on this model line, so buyers should verify whether a specific 80 PLUS rating applies to this SKU if certification is a procurement requirement.

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