A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Modules

This is an excellent product, I got two 4GB kits (4 modules), and all four worked just great, fully compatible with both Intel based computers where they were installed, I feel these memory modules are an excellent value, and revived a pair of 8+ year old computers, one of the computers is an Asrock G31M-GS based system, the other an Elitegroup 945GCT-M/1333 v3.0 with max RAM specs of 4GB (2 GB per slot) DDR2 667 MHz PC-5300, but I took a chance with these RAMs and they adjusted perfectly from 800 MHz down to 667 MHz (not all RAM modules can do this), in other words these modules can handle both 800 MHz PC-6400 and 667 MHz PC-5300. I would definitely like to try A-Tech's other RAM modules like DDR3 in the near future. It must be noted that (at least the ones I got), these RAMs can not handle the 533 MHz PC-4200 standard, this was not a problem for me, but if your motherboard/system is of an older type that can only accept this standard, then these modules won't work for you. Bottom line is that if your system/motherboard can handle 240-pin DIMM (Desktop PC), non ECC, DDR2, PC-6400 (800 MHz) or PC-5300 (667 MHz) RAM, then I would say there is a 99% chance these modules will be compatible with it. Tip, if for example you plan to get 4 GB of RAM,, get a kit (2 modules of 2 GB each), vs getting a single 4 GB stick, when you get a kit (two identical modules) you can benefit from dual channel, that way you can get a full 800 MHz speed vs just 400 MHz from a PC-6400 DDR2 when you use a single or an odd number of RAM sticks.

When I began to randomly get the dreaded "blue screen" I tested my old Optiplex 760's memory at startup by pressing the F12 key and, sure enough, there was a memory problem. Rummaging around on the web I found a description of the memory in this machine and did a search on Amazon. A huge number of choices came up but I picked this one based on the reviews about the reliability of the company and the support. It came a day early, was packaged professionally and the information on the package and the leaflet was obviously written by someone who was both knowledgable and proficient in English -- something that is becoming increasingly rare these days when instructions are often incomprehensibly written by a person struggling with a second language. There was a little card enclosed with installation hints, troubleshooting tips, a support number, and a believable promise of satisfaction. The memory installed without a hitch, fit perfectly in the slots in the computer, and worked flawlessly as well as passing the startup diagnostic tests when I ran them. I'll use A-Tech again!

For the price, these are amazing. I use these to update my ReadyNAS Pro/Ultra 6 units. They are old NAS boxes, but with a memory upgrade they are still hugely capable as backup devices. Extra memory is a welcome addition and at this price a no-brainer upgrade. It IS a little of a pain in the bu** to get them installed on the ReadyNAS (just very tight space) but they work perfectly once installed. Have bought several sets. Will buy again of need arises.

I bought this the first time for my HP Compaq DC7800 SFF computer two months ago, it worked well. When I bought it again to make it 8GB, one of the modules was defective on arrival. So, I had to throw out the defective module and make it 6GB instead with the remaining ones I have for it.

These DDR2s from A-Tech have been quite helpful in upgrading the refurbished Dell Precision T3400 that I bought several months ago. It came with 4GB, and I brought it up to 8GB. Three of the chips were quite easy to install. The fourth, with the slot falling partially under the power supply, was tricky. I'm visually impaired and have somewhat stubby finers, so it took several tries to get this last one in place. But, it finally popped in. I reset the BIOS, and started up the rig. Quite a bit faster! They work quite well. I've noticed especially that while running Firefox, I can have several pages pinned, and still not much of any decrease in speed. When necessary, I can have 2-3 instances of the browser open as well, with no appreciable slowdown. I've never been able to do that before, so thank you very much. I would definitely recommend the company's products and service to anyone needing new components.

Excelente

My sister has an older (circa 2009) Dell Inspiron 545 mini-tower system running Windows 7 Home Premium and it had started slowing down over time to the point where she asked me if I could take a look at it. After checking it out, I installed a well known utility program on it as well as an anti-virus program and expanded the onboard memory from the (factory) 6GB to 8GB (the maximum supported) since the video adapter shares memory with the main memory thereby slowing it down. These modules were completely compatible with the Dell and worked flawlessly, providing a noticeable performance increase. I would also note that these modules were also a little less than half price of some of the more well-known memory brands. I would highly recommend this manufacturer/product.

Added A-Tech 2x2Gb to a 4 slot motherboard with existing same size & capacity of no-name DDR2. 8Gb seems to be the minimum nowadays to keep things from slowing down. Booted right up; no compatibility or stability issues with AMD motherboard's automatic setting. Doubled memory plus a fresh reinstall of Windows 10, on a SSD resulted in a huge increase in speed in a 10 year old self-built PC. No need to swap out my business computer anytime soon. Memory install tip: The square end of a wooden chopstick works great to push in and seat memory modules.

Cumplió con los expectativas