The phrase "already existing hardware" is correct and usable in written English.
It can be used when referring to hardware that is currently in place or available, often in discussions about upgrades, compatibility, or system requirements.
Example: "The new software is designed to work seamlessly with already existing hardware, ensuring a smooth transition for users."
Alternatives: "currently available hardware" or "existing equipment".
Facebook, which has the extreme competitive advantage of this social graph, is reportedly working on its own foray into to mobile, as a "social layer" on already existing hardware.
The prototype machine (henceforth called MWL-AUC or MWL detector if referred to the detector for short) of the first generation described in [ 13] has been modified with respect to a simplification of the already existing hardware [ 13, 14] as described below.
The reason we're not seeing this Thunderbolt utilization already is because the existing hardware isn't ready for it yet.
Vidpresso, on the other hand, doesn't require any equipment on its own, and it works with the existing hardware that is already available in broadcast studios.
Competitors are legacy vendors who already provide courts or lawyers with existing hardware or software technology; we combine case management software with Internet communication software and host the solution on an extranet.
Those venues were probably moving in this direction already, since the SeatGeek tickets are taking advantage of their existing hardware.
Migicovsky says the Pebble is already designed for all-day wearability, so introducing these features should be fine for existing hardware owners, stretching all the way back to the original Kickstarter backers.
The Nest Cam IQ already has a microphone and speaker built-in for two-way communications, so this just repurposes that existing hardware.
The scheme did not require any specialized extra hardware or any change in the existing hardware architecture; it may even be able to be implemented in the firmware of the already installed hardware.
The hardware security module in that case must only handle table lookups; it can be implemented as its own module or also integrated into an existing hardware protected module or area (thus adding only little additional computational burden to the HSM already in use for other purposes).
Space Launch System's design called for the integration of existing hardware, spurring criticism that it's a "Frankenstein rocket," with much of it assembled from already developed technology.
