MiraBox

MiraBox HSV321 4K Capture Card

Expert rating5 / 10

Form Factor:: External USB
Max Recording Resolution:: 1080p60
Passthrough Resolution:: 4K60
HDR Support:: No

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Manufacturer: MiraBox Last updated: September 12, 2026

MiraBox HSV321 4K Capture Card Review

The MiraBox HSV321 is a budget external USB-C capture card recording 1080p60 with 4K60 passthrough in an aluminum housing, positioned as an affordable alternative to Elgato and AVerMedia's mid-range cards.

MiraBox has built a following among budget streamers looking for spec-competitive capture hardware without the established brand names' price tags, and the HSV321's aluminum shell at least gives it a sturdier feel than most dongles in this price range. Recording at 1080p60 with full 4K60 passthrough covers the basics most casual streamers actually need, and it's UVC-compliant enough to work without dedicated software if you'd rather just use OBS directly.

Spec-Competitive at a Budget Price

1080p60 capture with 4K60 passthrough matches or beats several pricier cards on paper, the real trade-off buyers make here is build consistency and software support quality rather than the core capture numbers.

Comparison to Alternatives

Against the Elgato HD60 X already in our catalog, both hit the same 1080p60 capture with 4K passthrough spec sheet, HD60 X adds HDR support and Elgato's established software and support behind it. Against the AVerMedia Live Gamer HD 2 GC570 in this list, the HSV321 adds 4K60 passthrough that the GC570 doesn't offer, a genuine spec advantage for a similar or lower price.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating5 / 10

Genuinely competitive spec for the price, with the build and software consistency trade-offs typical of budget capture brands.

Best for

Budget streamers wanting 4K passthrough without an established-brand price.
Casual console capture where 1080p60 recording covers the need.
Buyers who'd rather run OBS directly than a bundled proprietary app.

Not for

Buyers prioritizing established brand support and consistent firmware updates.
HDR capture or passthrough, not supported on this card.
Competitive gamers chasing the lowest possible measured latency.

Specifications

What these specs mean

Identity

Brand	MiraBox
Model Number	HSV321

Design

Form Factor	External USB
Connection Type	USB-C / Thunderbolt

Performance

Max Recording Resolution	1080p60
Passthrough Resolution	4K60
HDR Support	No

Signal handling

Latency	65 ms

FAQs

What are the key specifications of the MiraBox HSV321 4K Capture Card (External USB-C / 1080p60 Capture / 4K60 Passthrough / Aluminum Housing)?

Key specs for the MiraBox HSV321 4K Capture Card: Form Factor External USB, Connection Type USB-C / Thunderbolt, Max Recording Resolution 1080p60, Passthrough Resolution 4K60, HDR Support No.

Who is the MiraBox HSV321 4K Capture Card (External USB-C / 1080p60 Capture / 4K60 Passthrough / Aluminum Housing) best suited to?

Best suited to: Budget streamers wanting 4K passthrough without an established-brand price; Casual console capture where 1080p60 recording covers the need; Buyers who'd rather run OBS directly than a bundled proprietary app.

What are the drawbacks of the MiraBox HSV321 4K Capture Card (External USB-C / 1080p60 Capture / 4K60 Passthrough / Aluminum Housing)?

Not the best fit for: Buyers prioritizing established brand support and consistent firmware updates; HDR capture or passthrough, not supported on this card; Competitive gamers chasing the lowest possible measured latency.