Someone recently gave me one stick of 256MB PC2100. The machine I plan on sticking it in has a free slot with one slot already having one stick of 512MB PC3200. I know if stick it in that my DDR RAM will run at 266 MHz instead of 400. I sometimes run heavy applications like Adobe After Effects and Premier and I don't know if the benefits of having that extra 256 MB will outweigh the decrease in speed. My question is should I put in the PC2100? Would their be a noticeable performance increase or decrease? Here is the relevant information from CPU-Z: CPUID Output -------------------- Number of CPUs 1 APIC ID 0 Name AMD Sempron 3100+ Code name Paris Specification AMD Sempron(tm) Processor 3100+ Family/Model/Stepping FC0 Extended Family/Model F/C Brand ID 34 Package Socket 754 Core Stepping DH7-CG Technology 0.13um Instructions Sets MMX, Extended MMX, 3DNow!, Extended 3DNow!, SSE, SSE2 Features NX Clock Speed 1808.3 MHz Clock multiplier x9.0 HTT Bus Frequency 200.9 MHz P-Rating 3100+ L1 Data Cache 64 KBytes, 2-way set associative, 64 Bytes line size L1 Instruction Cache 64 KBytes, 2-way set associative, 64 Bytes line size L2 Cache 256 KBytes, 16-way set associative, 64 Bytes line size L2 Speed 1808.3 MHz (Full) L2 Location On Chip L2 Data Prefetch Logic yes L2 Bus Width 128 bits Chipset -------------------- Northbridge SiS 760 rev. 02 Southbridge SiS 964 rev. 36 Graphic Interface AGP AGP Revision 3.0 AGP Transfer Rate 8x AGP SBA supported, enabled Memory Type DDR Memory Size 512 MBytes Memory Frequency 200.9 MHz (CPU/9) CAS# 3.0 RAS# to CAS# 3 RAS# Precharge 3 Cycle Time (tRAS) 8 Bank Cycle Time (tRC) 11 DRAM Idle Timer 16 Command Rate 1T Memory SPD -------------------- DIMM #1 General Memory type DDR Manufacturer (ID) Hyundai Electronics (AD00000000000000) Size 512 MBytes Max bandwidth PC3200 (200 MHz) Part number HYMD264 646DP8JD43 Serial number FFFF1020 Manufacturing date Week 32/Year 05 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no EPP no Timings table Frequency (MHz) 133 166 200 CAS# 2.0 2.5 3.0 RAS# to CAS# delay 2 3 3 RAS# Precharge 2 3 3 TRAS 6 7 8

Don't install the PC2100

well good news is you added more meory the bad news is it will decrease your preformance and since you are running programs that use preformance then it would be a bad idea. AMD Athlon 64 X2 4400+ OC 2.7ghz 2GB Dual Channel DDR 3200 Nvidia 7800GT SATA II 2x 200gig 7200rpm 16mb cache RAID-0 Gigabyte Nforce 4 SLI

dido...unless your page file is like 500 megs all the time i think the preformace would be better w/o the 256 back up your back up...i just lost 300 gigs of "back up" and i don't have the originals for a lot of it.