Member Avatar for casben79

I am looking to upgrade my RAM, I have a dell optiplex gx620 and it has the standard mainboard serial no: 0F8101 ,
I am looking for someone who really knows what they are talking about to let me know that this item on ebay will work ok (assuming it works on arrival)

as the mainboard only takes 4GB i figure this is the best way as I can sell on the 2 Gb currently in my system.

Any advice?

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  • Latest Post Latest Post by kachimbo

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Short summary for this thread: the OptiPlex GX620 is officially a DDR2 system with a 4 GB maximum (either four 1 GB DIMMs or two 2 GB DIMMs). Desktop/mini-tower and small‑form‑factor revisions differ: most GX620 DT/MT/SFF boards accept unbuffered, non‑ECC DDR2 240‑pin DIMMs (533/667 MHz), and SFF machines sometimes only have two slots. (ro.scribd.com)

About the specific eBay kit (Samsung PC2‑6400 / DDR2‑800, 2x2 GB): higher‑speed DDR2 modules are often backward‑compatible, but the GX620 platform/chipset is specified for DDR2‑533/667 and may simply downclock faster sticks (and some GX620 BIOS/chipset combos will force 667->533). For the cleanest result, a matched 2x2 GB PC2‑5300 (DDR2‑667) unbuffered, non‑ECC kit (sold as a matched pair) is the recommended purchase; if two‑gig modules fail in one chassis, four matched 1 GB sticks are a reliable fallback. ()

Practical install and troubleshooting checklist (based on common GX620 behavior and the thread notes from and ):

  • Confirm chassis type (SFF = 2 slots, DT/MT = 4 slots) and install modules in the color‑coded matched slots for dual‑channel.
  • Try each new stick alone, then in the pair; run MemTest86 from USB to validate memory.
  • If problems appear, update the GX620 BIOS to the latest Dell release, reseat modules, and test different slot combinations.
  • Note that 32‑bit Windows often reports less than the full 4 GB (common ~3.2–3.5 GB usable), so a 64‑bit OS is only useful if the board/chipset supported >4 GB (GX620 is limited to 4 GB). (memtest86.com)

Thread tie‑in and recommendation: ’s hands‑on note that mixing similar sticks sometimes “works” and ’s report of a stable 4 GB install confirm the platform can be forgiving, but the safest path is a vendor‑listed matched kit (2x2 GB PC2‑5300, unbuffered/non‑ECC, 1.8 V). Test on arrival (MemTest86) and keep the seller return window open if any module fails. (kingston.com)

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Member Avatar for caperjack

I am looking to upgrade my RAM, I have a dell optiplex gx620 and it has the standard mainboard serial no: 0F8101 ,
I am looking for someone who really knows what they are talking about to let me know that this item on ebay will work ok (assuming it works on arrival)

as the mainboard only takes 4GB i figure this is the best way as I can sell on the 2 Gb currently in my system.

Any advice?

it should ,i have the exact chip in a gx620 right now ,along with 2 other different chip and all seems well

Edited by caperjack because: n/a
Member Avatar for caperjack

it should ,i have the exact chip in a gx620 right now ,along with 2 other different chip and all seems well

sorry ,i should have said same but different ,same brand and speed just single sided ,but the other 2 are double sided,i know not suppose to mix and match ,but just doing it for a bit

Edited by caperjack because: n/a
Member Avatar for kachimbo

i got the same computer i am running 4 gb of ram and is working awesome.
i can have 10 program open and still running good.
I have a p4 HT 3.6 ghz em64t capability

i got it from ebay too

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