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Processor of the day

Intel Pentium MMX 266 Mobile MMC-1 PMC26605001AA SL2N5 01.jpg
Intel Pentium MMX 266 Mobile (MMC-1)

Most popular CPUs

Intel Core 2 Duo E8800 (ES)
Intel Core 2 Duo E6200 (ES)
Intel Core 2 Duo E7700
Intel Core 2 Duo E7800
Intel Pentium II 266 (0,35µ)

Intel Core i7-3770
Intel Core i5-3470
Intel Core i5-2400
Intel Core i5-4570
Intel Core i7-2600

Most powerful CPUs
Desktop PCs
AMD : Ryzen Threadripper PRO 3995X
Intel : Core i9-10980XE
Laptop PCs
AMD : Ryzen 9 4900H
Intel : Core i9-10980HK
Servers
AMD : EPYC 7H12
Intel : Xeon Platinium 9282

Other articles > X86 Glossary > Write-Back Cache

A caching method in which modifications to data in the cache aren't copied to the cache source until absolutely necessary. Write-back caching is available on many microprocessors, including all Intel processors since the 80486.
With these microprocessors, data modifications (e.g., write operations) to data stored in the L1 cache aren't copied to main memory until absolutely necessary. In contrast, a write-through cache performs all write operations in parallel -- data is written to main memory and the L1 cache simultaneously.

Write-back caching yields somewhat better performance than write-through caching because it reduces the number of write operations to main memory. With this performance improvement comes a slight risk that data may be lost if the system crashes.

A write-back cache is also called a copy-back cache.


Used for : AMD 486, AMD Elan, Cyrix 486, IBM 486, ST 486