Intel Pentium 4 531 1-core LGA775

The Pentium 4 SL9CB is a 2005-era single-core chip with PassMark scores in the bottom 12th percentile. It's only worth buying for retro builds or repairing old LGA775 systems. For anything modern, look elsewhere.

The numbers tell the story. PassMark scores of 385 multi and 572 single put this chip in the bottom 12th percentile for multi-thread and 11th for single-thread performance. That's not just slow, it's 'one of the worst we've seen' territory. The 115W TDP is brutal for what you get, landing at the 14th percentile for efficiency. It'll run basic tasks on old software, but don't expect it to handle modern web browsing without wheezing.

Stacked against the top competitors in our database, this thing is in a different universe. The AMD Ryzen 7 9800X3D is a modern monster with 8 cores and 3D V-Cache. The Dell Xeon E5-2637 V2 and PC Server and Parts E5-2697 v2-cr are old server chips that still absolutely demolish the Pentium 4 in multi-threaded workloads. Even the G.Skill Trident Z Neo, which is RAM, not a CPU, has more relevance to a modern build. The only reason to pick the SL9CB is period-correct hardware restoration.

Value is tricky here. At 62nd percentile for affordability, it's not the cheapest old chip you can find, but it's not outrageous either. The USD listing at $130 feels steep for what you get. You can find newer used CPUs that run circles around this for less. But if you need this exact chip for a specific motherboard or retro project, the price is what it is. Nostalgia has a markup.

The Intel Pentium 4 SL9CB is a single-core relic from the mid-2000s. 3.0GHz, 1MB of L2 cache, and a 115W TDP that would make a modern laptop weep. It's a Socket LGA775 chip, so it only fits in motherboards from that era. If you're repairing an old Windows XP box or building a retro gaming rig, this might be your ticket. For anything else, it's a museum piece.

Skip this if you need a daily driver for web browsing, office work, or anything made after 2010. The single-core performance is abysmal, and the power draw is embarrassing. If you're on a tight budget, a used Core 2 Quad or even an old i3 will crush this chip for similar or less money.

Buy this if you're fixing up an old Socket LGA775 system or building a Windows XP era gaming rig. It's a genuine piece of computing history, and for that purpose, it does the job. For everyone else, this is a hard pass. You can get dramatically better performance from used hardware that costs less.