Starting part
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
Better fit if cas latency matters: 5 cycles listed.
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory vs Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
Side-by-side memory specifications, price freshness, and neutral decision guidance to help you carry the right part into your PC build.
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
Crucial
$15.49
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
Patriot
$48.99
Comparison complete · next step
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Starting part
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
Better fit if capacity matters: 16 GB listed.
Material specification differences
Direct specifications only - not benchmarks or an overall score.
- If cas latency matters: Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory lists 5 cycles.
- If capacity matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 16 GB.
- If speed matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 1866 MHz.
- If first word latency matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 10.718 ns.
- If voltage matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 1.5 V.
Specification profile
Each spec is scaled as a % of the leader in your selection - so even the runner-up stays visible on the chart.
Key specs at a glance
Top 4 specs that matter most. Full spec-by-spec breakdown is in the table below.
Performance
SpeedHigher is better
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
667 MHz
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
1866 MHz
CAS LatencyLower is better
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
5 cycles
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
10 cycles
First Word LatencyLower is better
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
14.993 ns
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
10.718 ns
Memory
CapacityHigher is better
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
2 GB
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
16 GB
Comparison complete · next step
Turn this memory kit decision into a compatible PC.
Choose the part you want to keep. Guided Builder carries it forward, then helps you set the budget and complete every remaining slot.
- Compared the specs
- Keep one memory kit
- Check the complete build
Choose your starting part
Guided Builder is recommended. Advanced stays available as the manual path.
Starting part
Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory
Better fit if cas latency matters: 5 cycles listed.
Starting part
Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory
Better fit if capacity matters: 16 GB listed.
Material specification differences
Direct specifications only - not benchmarks or an overall score.
- If cas latency matters: Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory lists 5 cycles.
- If capacity matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 16 GB.
- If speed matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 1866 MHz.
- If first word latency matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 10.718 ns.
- If voltage matters: Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory lists 1.5 V.
From comparison to complete build
Choose the part you want to build around.
Your selection carries into the builder. Guided Builder keeps it in place and helps you complete the remaining compatible parts.
- Compare specs
- 02Keep a part
- 03Finish the PC
| Component | $15.49 Checked 8/25/2026, 12:08:09 PM Continue with this part Keep it selected while you complete the rest of the PC. | $48.99 Checked 8/25/2026, 12:08:09 PM Continue with this part Keep it selected while you complete the rest of the PC. |
|---|---|---|
| Performance | ||
| Speed | 667 MHz | 1866 MHz |
| CAS Latency | 5 cycles | 10 cycles |
| First Word Latency | 14.993 ns | 10.718 ns |
| Memory | ||
| Capacity | 2 GB | 16 GB |
| Power | ||
| Voltage | 1.8 V | 1.5 V |
| Physical | ||
| Form Factor | DDR2 | DDR3 |
| Build | ||
| Color | Green | Black / Silver |
| Other | ||
| Price Updated At | 2026-08-25T12:08:09.344+00:00 | 2026-08-25T12:08:09.749+00:00 |
PC Launchpad earns commissions from qualifying purchases. Amazon prices can change at any time; confirm the current price and availability on Amazon before buying.
Common questions
How should I choose between these memorys?v
Start with the specifications that matter for your workload, then review power, physical fit, platform, and connectivity tradeoffs. PC Launchpad highlights only direct, verifiable specification differences and does not declare a universal winner.
Can I mix any of these memorys with the rest of my parts?v
PC Launchpad's Guided Builder checks compatibility across every component automatically. Click "Use in Build" on any option above and the builder will flag socket, form-factor, wattage, or clearance issues before you check out.
Where are the prices from?v
Prices come from Amazon availability, which PC Launchpad updates regularly. If a component is out of stock or prices change, the comparison may not reflect the latest number - always confirm on the retailer page before you buy.
Is the Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory better than the Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory?v
It depends on the workload. Use the chart summary above for the quick read, then look at the spec-by-spec breakdown to see which individual metrics favor which part. Verifiable numeric winners are emphasized only when the data has a clear direction, such as higher capacity or lower latency.
Which one is better value - the Crucial CT25664AA667 2 GB (1 x 2 GB) DDR2-667 CL5 Memory or the Patriot Viper 3 16 GB (2 x 8 GB) DDR3-1866 CL10 Memory?v
Value depends on your workload and the rest of the build. Compare the specifications you will actually use, then confirm the current retailer price before purchasing; PC Launchpad does not infer benchmark performance from catalog specifications.