SanDisk SDCFXS-064G-X46 Extreme 64GB Compact Flash Memory Card

Name: SanDisk SDCFXS-064G-X46 Extreme 64GB Compact Flash Memory Card
Brand: SanDisk
SKU: SDCFXS-064G-X46

Overview

The SanDisk Extreme SDCFXS-064G-X46 is a UDMA 7 CompactFlash card rated at 120MB/s read and 60MB/s write across a 64GB capacity. In concrete terms: 120MB/s read means a 64GB card filled with RAW files offloads to a UDMA 7 card reader in approximately 9 minutes — compared to roughly 12 minutes on a 90MB/s UDMA 6 card. The 60MB/s write rating is the more workflow-critical spec for shooters; it determines how quickly your camera's internal buffer drains after a burst sequence, directly influencing how long you wait before the next burst is available. The VPG-20 certification adds a contractual minimum: 20MB/s sustained write is guaranteed, which is sufficient to record Full HD video without dropped frames on any compliant device.

This card is built for professional photographers and videographers using DSLR or broadcast-heritage bodies with CompactFlash slots — Canon 5D-series, Nikon D800/D810/D4 class cameras, and similar pro-tier hardware from the UDMA 7 era. For those workflows, the combination of capacity, speed, and SanDisk's field-proven reliability makes this a defensible choice for a primary or backup card. The silicone-sealed construction is worth noting for event and outdoor photographers who subject cards to physical stress. The important constraint to understand upfront: CF is a mature, declining format. This card is not a future-proof investment — it is a high-quality consumable for existing CF-based systems.

Key Features

Fast transfer speeds up to 120MB/s(read) for increased workflow efficiency

Fast shot speeds up to 60MB/S (write) for faster continuous burst shooting

Video Performance Guarantee (VPG-20) performance for Full HD video

Tested for durability in extreme conditions

Sealed with RTV silicone for added protection against shock and vibration

Shoot like a Pro with the most trusted flash memory brand worldwide

Specifications

Capacity

64GB

Read Speed

Up to 120MB/s

Write Speed

Up to 60MB/s

Interface

CompactFlash (UDMA 7)

Video Performance Guarantee

VPG-20 (Full HD)

Protection

RTV silicone sealed (shock & vibration)

Flash Memory Type

CompactFlash

Color

Black

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Pros & Cons

👍 Pros

120MB/s read speed accelerates card-to-workstation offload, reducing ingest time versus the 90MB/s UDMA 6-class cards it replaces.
60MB/s sustained write speed supports fast burst clearing on high-megapixel bodies with deep buffers.
VPG-20 certification provides a contractual minimum write floor for Full HD video, eliminating dropped-frame risk during continuous recording.
RTV silicone sealing provides measurable protection against PCB damage from vibration and physical shock — relevant for field and event work.
64GB capacity hits the practical sweet spot for a full day of RAW shooting without requiring mid-session card swaps on most cameras.

👎 Cons

60MB/s write speed is a ceiling, not a floor — real-world sustained write performance under thermal stress can drop below the rated figure on extended burst sequences.
VPG-20 covers Full HD only; there is no 4K video performance guarantee, making this card unsuitable for 4K continuous recording workflows.
CompactFlash form factor is a legacy interface — this card has no relevance in CFexpress or SD-based camera systems, and the CF ecosystem is not receiving new camera support.
No read/write speed indicator on the card itself; verifying actual performance requires a dedicated card reader benchmark, which many users skip.

Frequently Asked Questions

Will this card work in cameras that use the older UDMA 6 standard, or does it require UDMA 7?

The SanDisk Extreme CF SDCFXS-064G-X46 is rated for UDMA 7 operation at 120MB/s read. It is backward compatible with UDMA 6 and earlier interfaces, but you will be limited to the maximum speed your camera's CF controller supports — typically 90–100MB/s on UDMA 6 bodies.

What does VPG-20 mean in practice for video recording?

VPG-20 (Video Performance Guarantee 20) is a minimum sustained write speed standard of 20MB/s. It guarantees the card will not drop below that threshold during continuous recording, preventing dropped frames during Full HD video capture. It does not certify 4K recording performance.

The write speed is listed at 60MB/s — how does that affect continuous burst shooting?

At 60MB/s write, the card can sustain throughput for cameras generating RAW files in the 25–45MB range at roughly 1.5–2.4 frames per second to card continuously. Burst performance is ultimately governed by the camera's internal buffer depth; this card clears that buffer faster than slower CF cards rated at 40MB/s write or below.

Is the RTV silicone sealing the same as weather sealing for use in harsh conditions?

The RTV silicone seal on this card protects the internal PCB against shock and vibration transfer — it is a structural protection measure, not a waterproofing or ingress protection rating. SanDisk tests this card for durability in extreme temperature and physical stress conditions, but it is not rated for submersion or direct water exposure.